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S + 8 + J + 8 = 56
S - 5 = 2 J - 10
S = 2 J - 5
S + J = 40 ---> J = 40 - S
S = 2 (40 - S) - 5
S = 80 - 2 S - 5
3 S = 75
S = 25 años
J = 40 - 25 = 15 años