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Edad de Manuel: X
3X + 15 = 2(X + 15)
3X + 15 = 2X + 30
3X + 2X = 30 - 15
X = 15
Edad actual de Carlos 3(15) + 15 = 45 + 15 = 60
Edad actual de Manuel: 15 + 15 = 30