Odpowiedź:
a) x - 9 = 12
x = 12 + 9
x = 21
b) 6 + x = 18
x = 18 - 6
x = 12
c) 4x - 5 = 11
4x = 11 + 5
4x = 16 /: 4
x = 4
d) - 9 - 2 x = 1
- 2x = 1` + 9
- 2x = 10 / : (- 2)
x = - 5
e) 12x - 7 = 5 * 8x
12x - 7 = 40x
12x - 40x = 7
- 28x = 7 / : (- 28)
x = - 7/28
x = - 1/4
f) 22 - 8x = - 2x + 10
- 8x + 2x = 10 - 22
- 6x = - 12 / : (- 6)
x = 2
Szczegółowe wyjaśnienie: