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7x+12-12x=x+12
12-12=x-7x+12x
0=20x
x=0
Verificamos:
7(0)+12-12(0)=0+12
12=12
7x - 12x + 12 = x + 12
- 5x + 12 = x + 12
- 5x - x = 12 - 12
- 6x = 0
x = 0/-6
x = 0
VERIFICAMOS :
7x + 12 - 12x = x + 12
7 (0) + 12 - 12 (0) + 0 + 12
0 + 12 - 0 = 12
12 = 12
La solución es correcta.