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