Răspuns:
a) 20x-3=-6
20x=-6+3
20x=-3
x=-3/20
d) -7(x-3)=-14
-7x+21=-14
-7x=-14+21
-7x=7
x=-7/7
x=-1
g) 2(x+8)+4=-6
2x+15+4=-6
2x+19=-6
2x=-6-19
2x=-25
x=-25/2
c) ?
f) ?
e)2(2x-3)=-10
4x-6=-10
4x=-10+6
4x=-4
x=-4/4
x=-1
h) (-5x-3)7=2
-35x-21=2
-35x=2+21
-35x=23
x=-23/35