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- 5x - 12 = x + 12
- 5x - x = 12 + 12
- 6x = 24
x = 24/-6
x = - 4
Solución :
x = - 4
VERIFICAMOS :
7x-12-12x=x+12
7 (-4) - 12 - 12 (-4) = - 4 + 12
- 28 - 12 + 48 = - 4 + 12
8 = 8
La solución es correcta.