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hijo =12
los años ha transcurrir = x
padre = 46 +x
hijo = 12 +x
46+x = 3(x+12)
46+x = 3x+36
46-36 = 3x -x
10 = 2x
10/2 = x
5 años = x
comprobacion
46+5 = 3(5 +12)
51 = 3*17
51 =51