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B = X
A - 5 = 4(X - 5)
A = 4X - 15
B = X - 5
IGUALAMOS A:
3X = 4(X - 5) + 5
3X = 4X - 15
X = 15
EDAD ACTUAL:
A = 3(15) = 45 AÑOS
B = 15 AÑOS