a) 9x -18 =-63
9x = -45
x = - 5
c) 8x +2= 10x-14
16 =2x
x =8
e) 1-4•[-5•(x-2)]= 21
-4•[-5•(x-2)]= 20
-5•(x-2)=-5
-5x +10 =-5
-5x = -15
x= 3
g)(x+3)(x-7)=0
x^2 -7x +3x -21=0
x^2-4x=21
b) 5x+15 =10x -10
25 =5x
x =5
d)-2x+10=-24x-16+56
22x = 30
x= 30 /22
x= 15/11
f)5x-10-7x-21+35=0
-2x+4=0
-2x= -4
x=2
h)(2x+6)(x+3)=0
2x^2+6x+6x+18=0
2x^2+12x+18=0