Răspuns:
a) 6x -15 = 0
6x = 0 + 15
6x = 15
x = 15/6
b) -12x + 6 = 0
-12x = 0 + 6
- 12x = -6
x = -6/-12
x = 1/2
c) -5x -10 = 0
-5x = 0+10
-5x = 10
x = -1/2