a, x - 34 - ( 15 + x ) - ( 23 - x )

= x - 34 - 15 - x - 23 + x

= x - 72

b, - ( -a + b - 2c ) + ( 2b + c - 1 ) - ( 6 - 26 )

= a - b + 2c + 2b + c - 1 - 6 + 26

= a + b + 3c + 19

a,(x-15)-75=0

x-15         =75

x              =75+15

x             =90

b,72-(6.x+5)=55

6.x+5=72-55

6.x+5=17

6.x=17-5

6.x=12

x=12:6

x=2

c,575-(6.x+70)=445

6.x+70=575-445

6.x+70=130

6.x=130-70

6.x=60

x=60:6

x=10

d,(x-34).15=0

x-34=0

x=34

e,15+(18-x)=26

18-x=26-15

18-x=11

x=18-11

x=7

g,(x-5):16=2

x-5=2.16

x-5=32

x=32+5

x=37

a ) x ∈ ± 23 28 . b ) x ∈ − 23 6 ; 35 6 . c ) x ∈ − 17 60 ; 97 60 . d ) x ∈ 67 140 ; 143 140 .

a/ (71+x) - [(-24) - x] + [(-35) - x ]=71+x+24+x-35-x=x+60

b/ x - 34 - [(15 + x) - (23 - x)]=x-34-15-x-23+x=x-72

c/ 26 - [(-x) + 126 - 13) + [(-113) + x]=26+x-126+13-113+x=2x-200=2(x-100)

a)(-6-18):(-4)

= { (-6) + (-8) } : (-4)

=(-24) : (-4)= (-6)

b)-28.(50-42)-35.(34-62)

= -28.8-35.(-28) 

= -28.(8-35)

= -28.(-27)=756

c)-18-(-5)+26

= -18+5+26

= -13+26=13

d)-72.69+31.(-72)

= -72.(69+31)

= -72.100=-7200

a) \(96-7\left(x+1\right)=14^4:14^3\)

\(\Rightarrow96-7\left(x+1\right)=14^{4-3}\)

\(\Rightarrow96-7\left(x+1\right)=14\)

\(\Rightarrow7\left(x+1\right)=96-14\)

\(\Rightarrow7\left(x+1\right)=82\)

\(\Rightarrow x+1=\dfrac{82}{7}\)

\(\Rightarrow x=\dfrac{82}{7}-1\)

\(\Rightarrow x=\dfrac{75}{7}\)

b) \(\left(5x+3^4\right)\cdot2^4=2^6\cdot7^2\)

\(\Rightarrow5x\cdot2^4+3^4\cdot2^4=2^6\cdot7^2\)

\(\Rightarrow5x\cdot2^4+6^4=\left(2^3\cdot7\right)^2\)

\(\Rightarrow80x+1296=3136\)

\(\Rightarrow80x=1840\)

\(\Rightarrow x=\dfrac{1840}{80}\)

\(\Rightarrow x=23\)

a: =>96-7(x+1)=14

=>7(x+1)=82

=>x+1=82/7

=>x=75/7

b =>5x+81=2^2*7^2=196

=>5x=115

=>x=23

a) \(96-7\left(x+1\right)=14^4:14^3\\ \Leftrightarrow96-7\left(x+1\right)=14\\ \Leftrightarrow7\left(x+1\right)=82\\ \Leftrightarrow x+1=\dfrac{82}{7}\\ \Leftrightarrow x=\dfrac{75}{7}\)

b) \(\left(5x+3^4\right)\cdot2^4=2^6\cdot7^2\\\Leftrightarrow5x+81=196\\ \Leftrightarrow5x=115\\ \Leftrightarrow x=23 \)

a) 12-3x=0

    3x=12-0

    3x=12

    x=12:3

    x=4

b)2x-26=25.12

   2x-26=300

   2x=300+26

   2x=326

   x=326:2

   x=163

c)5x+28=234:3

  5x+28=78

  5x=78-28

  5x=50

  x=50:5

  x=10

d)72-7x=529:23

   72-7x=23

   7x=72-23

   7x=49

   x=49:7

   x=7

k cho mình nhoa~~

a, (12-3x):20=0

=> 12-3x=0

=> 3x=12

=> x= 4             Vậy x=4

b, (2x-26):12=25

=> 2x-26=300

=> 2x=326

=> x=163           Vậy x= 163

c, 234:( 5x+28)=3

=> 5x+28=78

=> 5x=50

=> x= 10            Vậy x= 10

d, 529: (72-7x)=23

=> 72-7x=23

=> 7x=49

=> x= 7             Vậy x= 7

   Nhớ k cho mik nhé!!!! CẢM ƠN !!!

a.    M=71+x+21+x-35-x

       M=57+x

b.   N=x-34-(15+x-23+x)

N=x-34-38-2x

N=-72-x

the con phan c lam the nao

-1+2+3-4-5+6+7-8-9+...........+99-100-101

a) ( 71 + x ) - ( -24 - x ) + ( -35 - x )

= 71 + x + 24 + x - 35 - x

= ( 71 + 24 - 35 ) + ( x + x - x )

= 60 + x

b) x - 34 - [( 15 + x ) - ( 23 - x )]

= x - 34 - ( 15 + x - 23 + x )

= x - 34 - ( 15 - 23 + x2 )

= x - 34 - ( - 8 + 2x )

= x - 34 + 8 - 2x

= x - 2x + 8 - 34

= -x - 26

c) ( -15 + |x| ) + ( -25 - |x| )

= -15 + |x| - 25 + |x|

= -15 - 25 + x + x

= -40 + x2

a)(71+x)-(-24-x)+(-35-x)

=>71+x+24+x-35-x

=>60+x

b)x-34-[(15+x)-(23-x)]

=>x-34-(15+x-23+x)

=>x-34-15-x+23-x

=-x-26

71 + ( 26 - 3 . x ) ; 5 = 75 

        ( 26 - 3x ) : 5 = 75 - 71 

         ( 26 - 3x ) : 5 = 4 

          26 - 3x = 4.5 

          26 - 3x = 20

               3x = 26 - 20

               3x = 6

                x = 6 : 3 

                x = 2