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2x - 8 = x + 7
2x - x = 8 + 7
x = 15
Respuesta: x = 15
Tu ecuacion solo tiene una variable y es x
2(x - 4) = x + 7
2x - 8 = x + 7
2x - x = 7 + 8
x = 15
Respuesta.
x = 15