Odpowiedź:
a) 4x + 8 = 2x - 6
4x - 2x = -6 -8
2x = -14
x = -7
b) 2x + 4 = x + 9
2x - x = 9 - 4
x = 5
c) 6x - 8 = 4x + 12
6x - 4x = 12 + 8
2x = 20
x = 10
d) 3x + 7 = -8x - 15
3x + 8x = -15 -7
11x = -22
x = -2
e) -8x - 8 = -8x + 9
-8x + 8x = 9 + 8
0 = 17
rownanie sprzeczne
