1. 4x + 7 = 39 /-7
4x = 32 / : 4
x = 8
2. -2x - 5 = - 31 /+5
-2x = - 26 /:(-2)
x = 13
3. 8 + 5x = -42 /-8
5x = - 50 / : 5
x = - 10
4. 4x - 5 + 3x = 9 + 7
7x = 21 / : 7
x = 3
5. 2x + 5x - 3 = 4x + 2 - x +3
4x = 8 / : 4
x = 2
liczę na naj i nie ma zaco
