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30-X = monedas tiene de $5.
2X + 5(30-X) = 96
2X + 150 - 5X = 96
150 - 96 = 5X - 2X
54 = 3X
X = 54/3
X = 18 monedas tiene de $2.
30-X = 30 - 18 = 12 monedas tiene de 5$.
12 x 5 = 60
36+60= 96