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x + 80 = 5x
80 = 5x - x
80 = 4x
80/4 = x
20 = x
Respuesta.
20
X+80=5x
(Restas x a ambos lados)
80=4x
(Divides entre 4 a ambos lados)
20=x
El número es 20.
saludos y suerte. ^^