a: =>x-15=20

hay x=35

c: =>12x=360

hay x=30

(x-42) - 17 = 127

=> x - 42 = 127 + 17 = 144

=> x = 144 + 42 = 186

23(x+1) = 69

=> x + 1 = 69 : 23 = 3

x = 3 - 1 = 2

2x + 5 = 120 : 2 = 60

=> 2x = 60 - 5 = 55

x = 55 : 2 = 27,5

5x - 2 = 613

=> 5x = 613 + 2 = 615

x = 615 : 5 = 123

a)(x-42)-17=127

(x-42)=127+17

(x-42)=144

x=144+42

x=186

b)23(x+1)=69

(x+1)=69:23

(x+1)=3

x=3-1

x=2

c)2.x+5=120:2

2.x+5=60

2.x=60-5

2.x=55

x=55:2

x=27,5

d)5.x-2=613

5.x=613+2

5.x=615

x=615:5

x=123

(x-42)-17=127(tim x)xx

23(x+1)=69(timx)xx

2x+5=120:2(Timx)xx

5x-2=613(timx)xx

a) (x - 7) + 5 = 16

=>   x - 7 = 11

=>  x  =  18

b) 4 : x - 34 = 6

=>  4 : x = 40

=>  x  =  \(\frac{1}{10}\)

c) 120 : ( x - 1 ) + 3 = 23

=>  120 : ( x - 1 ) = 20

=>  x - 1 = 6

=>  x  = 7

d) 170 - ( x-7) : 5 = 20

=>  ( x - 7 ) : 5 = 150

=>  x - 7  = 750

=>   x   =  757

e) x + 12 + 2 .x + 3 = 4.x + 3

=>  3x + 17  = 4x  + 3

=>  x  = 15 

\(a,x-7=11\)

\(x=18\)

\(b,x-36=\frac{2}{3}\)

\(x=\frac{110}{3}\)

\(c,120:\left(x-1\right)=20\)

\(x-1=6\)

\(x=7\)

\(d,\left(x-7\right):5=150\)

\(x-7=10\)

\(x=17\)

\(d,x+12+2.x+3-4.x-3=0\)

\(x.\left(1+2-4\right)+3-3+12=0\)

\(x.\left(-1\right)+12=0\)

\(x.\left(-1\right)=-12\)

\(x=12\)

a) (x - 7) + 5 = 16

x - 7 = 16 - 5 

x - 7 = 11

x = 11 + 7

x = 18

b) 4 : x - 34 = 6

4 : x = 6 + 34

4 : x = 40

x = 4 : 40

x = 1/10

c) 120 : ( x - 1 ) + 3 =23

120 : ( x - 1 ) = 23 +3

120 : ( x - 1 ) =26

x -1 = 120 :26

x - 1 =13/60

x = 13/60 + 1

x = 73/60

d) 170 - ( x - 7 ) :5 =20

170 - ( x - 7 ) = 20:5

170 - ( x - 7 ) =4

x- 7 = 170 - 4

x - 7 = 166

x = 166 + 7

x = 173

còn câu e mik ko bt làm nhé mà k cho mik nhé

a) => y+42+2y= -12-14+2y

y+2y-2y = -12-14-42

y= -68

b) => 15+y-5-5y= -12-5y

y-5y+5y= -12-15+5

y = -22

c) => 2y+5-8y+21= -3-5y-2

2y-8y+5y= -3-2-5-21

-y= -31=>y=31

d)=> -13+3y+23= -120+y

3y-y= -120+13-23

2y= -130=>y= -65

e) => -21+32+5y= 16+4y

5y-4y= 16+21-32

y= 5

bài 1

a)y-(-42-2y) = (-12) - 14 +2y

y +42 + 2y = -12 -14 +2y

3y + 42 = -26 +2y

y = -68

b)15-(-y+5)-5y=-(12+5y+2)

15+y-5-5y=-12-5y-2

10-4y=-14-5y

-4y+5y=-14-10=-24

c)2y-(-5+8y-21)=-3-(5y+2)

2y+5-8y+21=-3y-5y-2

-6y+26=-8y-2

-6y+8y=-2-26

2y=-28

y=-28/2=-14

1)

a) 2x + 5 = 3⁴ : 3²

2x + 5 = 3²

2x + 5 = 9

2x = 9 - 5

2x = 4

x = 4 : 2

x = 2

b) (3x - 24).73 = 2.74

(3x - 24).73 = 148

3x - 24 = 148/73

3x = 148/73 + 24

3x = 1900/73

x = 1900/73 : 3

x = 1900/219

c) [3.(42 - x)] + 15 = 23.3

126 - 3x + 15 = 69

141 - 3x = 69

3x = 141 - 69

3x = 72

x = 72 : 3

x = 24

d) 126 + (132 - x) = 300

132 - x = 300 - 126

132 - x = 174

x = 132 - 174

x = -42

2)

a) 120 - (x + 55) = 60

x + 55 = 120 - 60

x + 155 = 60

x = 60 - 55

x = 5

b) (7x - 11).3 = 25.52 + 200

(7x - 11).3 = 1500

7x - 11 = 1500 : 3

7x - 11 = 500

7x = 500 + 11

7x = 511

x = 511 : 7

x = 73

c) 2x + 2x + 4 = 544

4x = 544 - 4

4x = 540

x = 540 : 4

x = 135

3) 

a) 10 + 2x = 49 : 47

10 + 2x = 49/47

2x = 49/47 - 10

2x = -421/47

x = -421/47 : 2

x = -421/94

b) 70 - 5(x - 3) = 45

5(x - 3) = 70 - 45

5(x - 3) = 25

x - 3 = 25 : 5

x - 3 = 5

x = 5 + 3

x = 8

c) 4 + 95 : x = 143 : 142 - 23

4 + 95 : x = -3123/142

95 : x = -3123/142 - 4

95 : x = -3691/142

x = 95 : (-3691/142)

x = -13490/3691

cau1 :120-(100+x)=25

100+x=120-25

100+x=95

x=-5

cau2: 5(x+23)+6=96

5(x+23)+6=96

5(x+23)=90

x+23=18

x=-5

cau3: 100-(25+x)=40

25+x=100-40

25+x=60

x=35

cau4: 35-9(x+2)=45

9(x+2)=-10

x+2=-10/9

x=-28/9

cau 4 cua ban ghi gi minh ko  hieu

Bài 2:

a: =6(15-5)=6*10=60

b: =9(-3+23)=9*20=180

c: =11(-10+210)=11*200=2200

d: =125*4+125*4=125*8=1000

a) 5.2² - 18 : 3

= 5.4 - 18 : 9

= 20 - 2

= 18

b) 17 . 85 + 15 . 17 - 120

= 17 . (85 + 15) - 120

= 17 . 100 - 120

= 1700 - 120

= 1580

c) 2³ . 17 - 2³ . 14

= 8 . 17 - 8 . 14

= 8 . (17 - 14)

= 8 . 3

= 24

a) 5 . 2² – 18 : 3² 

= 5.4 – 18 : 9

= 20 – 2

= 18

b) 17 . 85 + 15 . 17 – 120

= 17. (85 + 15) – 120

= 17.100 – 120

= 170 – 120

= 50

c) 2³ . 17 – 2³ . 14

= 2³.(17 - 14)

= 2³.3

= 8.3

= 24

a) 18

b) 50

c) 24