Odpowiedź: Jak niżej.
Szczegółowe wyjaśnienie:
9x - 40 = 14 / + 40
9x = 14 + 40
9x = 54 / : 6
x = 6
20x + 7 = 31
20x = 24
x = 1,2
6x - 25 = -25
6x = 0
x = 0
12x + 4 = 11x + 15 / -11x
x + 4 = 15 / -4
x = 11
3x - 1 = 2x + 1
x = 2
2x + 7 = x - 1
x = -8
4x - 3(x - 3) = x - 4
4x - 3x + 9 = x - 4
x + 9 = x - 4
9 = -4 sprzeczne
2x - (3 - 2x) = 5 + x - x
2x - 3 + 2x = 5
4x = 8
x = 2
4x - 3(3x - 5) = 6x + 4
4x - 9x + 15 = 6x + 4
-5x + 15 = 6x + 4
11 = 11x
x = 1
8 - (4x - 12) = 8x - (3x - 2)
8 - 4x + 12 = 8x - 3x + 2
20 - 4x = 5x + 2
18 = 9x
x = 2
