zad 2 str 193 matematyka klasa 7, tylko punkty d) e) f) plss

d)
6x + 5 = 4x
6x - 4x = -5
2x = -5 | : 2
x = -2,5
e)
9x - 3 = 2x + 5
9x - 2x = 5 + 3
7x = 8 | : 7
x = 8/7 = 1 i 1/7
f)
-3x + 4 = -5x - 1
-3x + 5x = -1 - 4
2x = -5 | : 2
x = -2,5