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7x - 12 - 12 x = -x + 12
7x -12x -12 = -x + 12
7x -12x + x = 12 + 12
-4x = 24
x = 24 /(-4)
x = -6
Substituyendo - 6 en la ecuacion
7*(-6) - 12 - 12*(-6) = - (-6) + 12
-42 -12 + 72 = 6 + 12
- 54 + 72 = 18
18 = 18