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Edad hijo: y
x-4 = 9(y-4)
x-4 = 9y -36
x = 9y -32....(a)
x+8 = 3(y+8)
x+8 = 3y +24
x = 3y+16....(b)
Igualando (a) y (b)
9y - 32 = 3y + 16
6y = 48
y = 8
x = 40
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