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3x - 8 = x + 4
3x - x = 4 + 8
2x = 12
x = 12/2
x = 6
Respuesta.
x = 6
COMPROBAMOS LA SOLUCIÓN
3x - 8 = x + 4
3 (6) - 8 = 6 + 4
18 - 8 = 10
10 = 10
La solución es correcta!!!