A)5x+11=66
5x=66-11
5x=55
x=55/5
x=11
B)x*(-7)=14
-x=14/7
-x=2 inmultim -1
x=-2
C)5x=-30
x=-30/5
x=-6
D)12x=-8+4x
12x-4x=-8
8x=-8
x=-8/8
x=-1
E)9(x-2)=-63
9x-18=-63
9x=-63+18
x=-45/9
x=-5
F) 1-4*[-5*(x-2)]=21
1-4(-5x+10)=21
1+20x-40=21
20x=21+40-1
20x=60
x=60/20
x=3
G)(x+3)(x-7)=0
x1=-3
x2=7