Odpowiedź:
2x - 12 = 6 |+12
2x = 6 + 12
2x = 18 |:2
x = 9
4 + 5x = 34 |-4
5x = 34 - 4
5x = 30 |:5
x = 6
-8x + 10 = 4 |+8x
10 = 4 +8x |-4
10 - 4 = 8x
8x = 6 |:8
x = 0.75
9 - x = 21 |+x
9 = 21 + x | -21
9 -21 = x
-12 = x
x = -12
1/3x - 4 = 5 | +4
1/3x = 5 + 4
1/3x = 9 |•3
x = 9 • 3
x = 27
