Odpowiedź:
c) 9x = 6x-12
9x- 6x = -12
3x= -12 //:3
x= -4
d) 8x= 3x+15
8x-3x = 15
5x = 15 //:5
x= 3
e) 7x - 3= 2x-8
7x- 2x= -8 +3
5x = 5 //:5
x= 1
f) 10- 2x = 19 - 5x
-2x + 5x = 19 - 10
3x = 9 //:3
