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x+10=3(y+10)
x+y=60................x=60-y
sustituimos x=60-y en la primera ecuacion.
x+10=3(y+10)
60-y+10=3y+30
70-y=3y+30
70-30=3y+y
40=4y
40/4=y
10=y
la edad del hijo es 10 años