Răspuns:
a) 3•x - 17 = 2
3x = 2 + 17
3x = 19
x = 19/3 ∉ Z
b) -5x +14 = 27
14 - 27 = 5x
- 13 = 5x
x = - 13/5 ∉ Z
c) x + 3 = 4x - 7
3 + 7 = 4x - x
10 = 3x
x = 10/3 ∉ Z
d) -72 : (x + 1) = 14
- 72 = 14(x + 1)
- 72 = 14x + 14
- 72 - 14 = 14x
- 86 = 14x
x = - 86/14
x = - 43/7 ∉ Z