a)15 - x = 7 - (-2)

15-x = 9

x = 15 - 9

x = 6

b) 11 - ( 15 + 11 ) = x - (25 - 9 )

11 - 26 = x - 16

-15 = x - 16

-15 + 16 = x 

1 = x

c) ( 7 - x ) - ( 25 + 7 ) = 9 - 25

(7-x) - 32 = -16

(7-x) = -16 + 32

7-x = 16

x = 7-16

x = -9

a, 11 - ( 15 + 11 ) = x - ( 25 - 9 )

11-15-11=x-25+9

-15=x-16

x=1

b, 2 - x = 17 - ( - 5 )

2-x=22

x=-20

c, x - 12 = ( - 9 ) - 15

x-12=-24

x=-12

d, 9 - 25 = ( 7 - x ) - ( 25 + 7 )

(7-x)-32=-16

7-x=16

x=-9

#H

11 - (15+11) = x - (25 - 9)

11-15-11=x-25+9

-15=x-16

x=-15+16

x=1

11 - (15+11) = x - (25 - 9)

11-26=x-16

-15=x-15

x=-15+16

x=1

Hồ Thu Giang saj

11 – (15 + 11) = x – (25 – 9)

11 -15 -11 = x – 16

-15 = x – 16

-15 + 16 = x

X = 1

\(11-15-11+2x=x-16\\ \left(11-11\right)-15+2x=x-16\\ 0-15+2x=x-16\\ -15+2x=x-16\\ 2x-x=-16+15\\ x.\left(2-1\right)=-1\\ x.1=-1\\ x=-1\)

11-(15+11-2x)=x-(25-9)

11-15-11+2x=x-16

2x-x=-11+15+11-16

x=-1

Vậy x=-1

11 - ( 15 + 11 ) = x - ( 25 - 9 )

             11 - 26 = x - 16

                  - 15 = x - 16

          - 15 + 16 = x

                      1 = x. 

Nhớ tick mình nhé !

=> x - 16 = 15

=> x = 15 + 16

x = 31

11-(15+11)=x-(25-9)
11-26       =x-(25-9)
-15           =x-(25-9)
-15           =x-16
 16+(-15)   =x
      1         =x

\(11-\left(15+11-2.x\right)=x-\left(25-9\right)\)

\(11-15-11+2x=x-16\)

\(2x-x=-16-11+15+11\)

\(1x=-1\)

\(x=-1\)

a/ 11-(15+11)=x-(25-9)

-15=x-16

x=-15+16=1

tik nha bn hiền

<=> 11 - 26 = x - 16

<=> - 15 = x - 26

<=> x = - 15 + 26

=> x = 11

11-26=x-16

suy ra : 11-26+16=x

x=1