Odpowiedź:
1. y + 18 = 50
y = 50 - 18
y = 32
2. 19x + 6 = 18
19x = 18 - 6
19x = 12 / : 19
x = 12 / : 19
3. 17x + 3 = 15 + 13x
17x - 13x = 15 - 3
4x = 12 / : 4
x = 3
4. -7x = -28 / : -7
x = 4
5. 5x = 6x -9
5x - 6x = -9
-x = -9 / : - 1
x = 9
6. 4a - 49 = 9a + 11
4a - 9a = 11 + 49
- 5a = 60 / : -5
a = - 12
7. 6 (x + 2) = 7 (x + 7)
6x + 12 = 7x + 49
6x - 7x = 49 - 12
-x = 37 / : -1
x = -37
8. 2 (x + 4) = 7 (x + 3)
2x + 8 = 7x + 21
2x - 7x = 21 - 8
-5x = 13 / : - 5
x = - 13 / 5
