Răspuns:
3.
2x-1=-3
2x=-3+1
2x=-2
x=-1 ∈ A = {-3, -2, -1, 2}
4.
-3x+1=-8
-3x=-8-1
-3x=-9
x=3 ∈ B = {-1, 0, 1, 3}
