Odpowiedź:
Szczegółowe wyjaśnienie:
a) 2x + 9 = 1
2x = 1 - 9
2x = - 8. /:2
x = - 4
b) 7x - 5 = 6x + 8
7x - 6x = 8 + 5
x = 13
c) - (x - 2) + 3(x - 1 ) = - 2
- x +2 + 3x - 3 = -2
2x - 1 = - 2
2x = - 2 + 1
2x = - 1. /:2
x = - ½
d) 9x + 3 = 7(x - 2) + 17
9x + 3 = 7x - 14 + 17
9x - 7x = 3 - 3
2x = 0. /:2
x = 0
