a)
2x - 7 = 9
2x = 9 + 7
2x = 16
x = 8 (więc masz dobrze)
b)
4x - 3 = 3x + 5
4x - 3x = 5 + 3
x = 8
c)
4(x-8) = 4
4x - 32 = 4
4x = 4 + 32
4x = 36
x = 9
