2 .0.52x-( 1-0.52)x=80

3 .x/2+3x/2=7

4 .3x+7=32-2x

5 .3x+5( 138-x)=540

6 .3x-7(x- 1)=3-2(x+3)

7 . 18x+3x-3 = 18-2(2x- 1)

8 .3(20-y)=6y-4(y- 1 1)

9 .-(x/4- 1)=5

10.3[4(5y- 1)-8]=6

1 1.5x- 10=8

12. 12(x-5)= 15

13.4(5y- 1)-8=6

14.3[4(5y-7)-8]=y

15.32[4(8x- 1)-8]=6

16.2[4(5y- 1)-y]= 16

17. 12[8(5y+ 1)-8]= 60

18.6[4(x- 1)-8]=x

19.3[6(5x+3)-8]=6x

20.7[4(5y- 1)+8]=25y