Odpowiedź:
Poziom A
a) 4 * x - 3 + 5 * x = 15
4x +5x = 15 + 3
9x = 18 | :9
x = 2
b) 5 * x + 7 - 3 * x = 13
5x - 3x = 13 -7
2x = 6 | :2
x = 3
c) 7 * x - 2 - 6 * x = 5
7x - 6x = 5 + 2
x = 7
d) 6 * x - 4 + 4 * x = 56
6x + 4x = 56 + 4
10x = 60 | :10
x = 6
Poziom B
a) 6 * x = 2 * x - 8
6x - 2x = - 8
4x = -8 | :4
x = - 2
b) 8 * x = 9 + 5 * x
8x - 5x = 9
3x = 9 | :3
x = 3
c) 7 * x = 2 * x - 20
7x - 2x = -20
5x = -20 | :5
x = - 4
d) 2 * x = 12 - 2 * x
2x + 2x = 12
4x = 12 | : 4
x = 3
Poziom C
a) 8 - 3 * x = 6 * x - 10
-3x - 6x = -10 - 8
-9x = - 18 | : (-9)
x = 2
b) 7 * x - 4 = 9 + 8 * x
7x - 8x = 9 + 4
-x = 13 | * (-1)
x = - 13
c) -5 + 7 * x = 2 * x - 20
7x -2x = - 20 + 5
5x = - 15 | :5
x = - 3
d) 8 - 2 * x = -4 + 2 * x
-2x - 2x = -4 - 8
- 4x = -12 | : (-4)
x = 3