A) 9x-18=-63
9x=-45/:9
x=-5
B)8x+2=10x-14
8x-10x=-14-2
-2x=-16/:(-2)
x=8
C)1-4•[-5•(x-2)]=21
1-4•(-5x+10)=21
1+20x-40=21/+40
1+20x=61/-1
20x=60/:20
x=30
E)5x+15=10x-10
5x-10x=-10-15
-5x=-25/:(-5)
x=5
F)-2x+10=-24x-16+56
-2x+24x=56-16-10
22x=30
30 15
X=— =—
22 11
G)5x-10-7x-21+35=0
-2x=-35+21+10
-2x=-4/:(-2)
x=2