Odpowiedź:
b) 2x - 12 = 6 / =12
2x = 18 / :2
x = 9
c) 4 + 5x = 34 / -4
5x = 30 / :5
x = 6
d) -8x + 10 =4 -10
-8x = -6 / : (-8)
x = 0,75
e) 9 - x = 21
-12 = x
f) 1/3x - 4 = 5 / +4
1/3x = 9/ *3
x = 27
