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X+3 = monedas hay de 5$
2X + 5(X+3) = 155
2X + 5X + 15 = 155
2X + 5X = 155 - 15
7X = 140
X = 140/7
X = 20 monedas de 2$ hay.
20+3 = 23 monedas de 5$ hay.