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(x-7) +(y-7) =x
x+y-14=x
y=14
x=28
A = 2B
(A - 7) + (B - 7) = A ⇒ A + B = A + 14 ⇒ B = 14
A = 2(14) = 28
la primera persona tiene 28 y la segunda tiene 14 años