a,575-(6x+70)=445

<=> 6x + 70   = 575 - 445 

<=> 6x + 70   = 130

<=> 6x           = 130 - 70

<=> 6x           = 60

<=>   x           = 10

b, 720 : [ 41 - ( 2x - 5 ) ]= 2³. 5

<=> 720 : [ 41 - ( 2x - 5 ) ] = 40

<=>            41 - ( 2x - 5 )   = 18

<=>                     2x - 5      = 41 - 18

<=>                     2x - 5      = 23

<=>                     2x           = 28

<=>                       x           = 14

a)  6x+70 = 575 - 445

    6x+70=   130

   6x     = 130 - 70

   6x    = 60

   x     =60 : 6

  x     =10

a, 575 - (6x+70)=445

6x+70=575-445

6x+70=130

6x=130-70

6x=60

x=60:6

x=10

Vậy x=10

b, 720 : [41-(2x-5)]=2^3.5

720 : [41-(2x-5)]=8.5

720 : [41-(2x-5)]=40

41-(2x-5)=720:40

41-(2x-5)=18

2x-5=41-18

2x-5=23

2x=23+5

2x=28

x=28:2

x=14

Vậy x=14

a) 575 - ( 6x + 70 ) = 445

6x + 70 = 575 - 445

6x + 70 = 130

6x = 130 - 70

6x = 60

x = 10

b) ( 3 - x ) * ( x - 3 ) = 0

=> 3 - x = 0           hoặc           x - 3 = 0

x = 3                                       x = 3

Vậy x = 3

 a)575 - ( 6x + 70 ) = 445 
<=> -6x - 70 = 445 - 575 
<=> -6x = -60 
(chuyển vế hoặc cùng nhân 2 vế cho - 1) 
<=> 6x = 60 
<=> x = 10 
 
 

6x =60 sao x=10

b)315+(125-x)=435

125-x=435-315

125-x=120

x=125-120

x=5

a)  575 - ( 6x + 70 ) = 447

              ( 6x + 70 ) = 575 - 447

              ( 6x - 70 ) = 128

                6x          = 128 + 70

                6x         = 198 

                  x         = 198 : 6

                  x         = 33

b)  315 + ( 125 - x ) = 435

               ( 125 - x ) = 435 - 315

                 125 - x   = 120

                          x   = 125 - 120

                          x   = 5

a) ( x - 15 ) - 75 = 0

<=> x - 15 = 75

<=> x = 90

b) 575 - ( 6x + 70 ) = 445

<=> 6x + 70 = 130

<=> 6x = 60

<=> x = 10

c) 315 + ( 125 - x ) = 435

<=> 125 - x = 120

<=> x = 5

a, ( x - 15 ) - 75 = 0

x - 15 = 0 + 75 

x - 15 = 75

x = 75 + 15

x = 90

b, 575 - ( 6x + 70 ) = 445

6x + 70 = 575 - 445

6x + 70 = 130

6x = 130 - 70

6x = 60

x = 60 : 6

x = 10

c, 315 + ( 125 - x ) = 435 

125 - x = 435 - 315 

125 - x = 120

x = 125 - 120

x = 5

Học tốt

(x-15)=0+75

(x-15)=75

x=75+15

x=90

vậy x=90

(6x+70)=575-445

(6x+70)=130

6x=130-70

6x=60

x=60:6

x=10

vậy x=10

(125-x)=435-315

(125-x)=120

x=125-120

x=5

vậy x=5

\(a,\Rightarrow6x+70=130\Rightarrow6x=60\Rightarrow x=10\\ b,\Rightarrow240=\left(x+70\right):14-40\\ \Rightarrow\left(x+70\right):14=280\\ \Rightarrow x+70=3920\Rightarrow x=3850\\ c,\Rightarrow x-15=75\Rightarrow x=90\\ d,\Rightarrow\left(x+175\right):5=680-30=650\\ \Rightarrow x+175=3250\Rightarrow x=3075\\ e,\Rightarrow x-4867=1004523\Rightarrow x=1009390\\ f,\Rightarrow x+32-17=24\Rightarrow x=9\\ g,\Rightarrow3\left(x+1\right)=54\Rightarrow x+1=18\Rightarrow x=17\\ h,\Rightarrow19\left(35:x+3\right)=152\\ \Rightarrow35:x+3=8\Rightarrow35:x=11\Rightarrow x=\dfrac{35}{11}\)

a: \(\Leftrightarrow73-x=67\)

hay x=6

Bài 7:

a)(x-15)-75=0

⇔x-15=75

⇔x=90

b)575-(6x+70)=445

⇔6x+70=130

⇔6x=60

⇔x=10

c)x-105:21=15

⇔x-5=15

⇔x=20

d)(x-105):21=15

⇔x-105=315

⇔x=420

X x 13 = 39

X = 39 : 13

X = 3

( x - 15 ) - 75 = 0

x - 15 = 0 + 75

x - 15 = 75

x = 75 + 15

x = 90

6x - 39 = 201

6x = 201 + 39

6x = 240

x = 40

X x 13 = 39

X = 39 : 13

X = 3

( x - 15 ) - 75 = 0

x - 15 = 0 + 75

x - 15 = 75

x = 75 + 15

x = 90

6x - 39 = 201

6x = 201 + 39

6x = 240

x = 240 : 6

x = 40

575 - ( 6x +70 ) = 445

6x + 70 = 575 - 445

6x + 70 = 130

6x = 130 - 70

6x = 60

x = 60 : 6

x = 10

X x 13 = 39

X = 39 : 13

X = 3

( x - 15 ) - 75 = 0

x - 15 = 75

x = 75 - 15

x = 50

6x  - 39 = 201

6x = 162

x = 162 : 6

x = 27

575 - ( 6x +70 ) = 445

6x + 70 = 575 - 445

6x + 70 = 130

6x = 60

x = 10

a ) ( x - 15 ) - 15 = 0  

        x - 15          = 15

        x                  = 15 + 15

        x = 30

a ) ( x - 15 ) - 15 = 0

       x - 15         = 0 + 15

       x - 15         = 15

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