Odpowiedź:
3(a - 1) = - a
3a - 3= - a
3a + a = 3
4a = 3
a = 3/4
7x + 4 = 7x - 3
7x - 7x = - 3 - 4
0 ≠ - 7
x ∈ ∅ (zbiór pusty)
6 + 2x = 6x- 2
2x- 6x = -2 - 6
-2x = - 8
2x = 8
x = 8/2 = 4
7x- 6 = - 6x + 7
7x+ 6x = 7 + 6
13x = 13
x = 13/13 = 1
- 7(2x + 1) = 4
- 14x - 7 = 4
- 14x = 4 + 7
- 14x = 11
14x = - 11
x = - 11/14