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Tenemos: a / 6 = b / 3 = c / 4 = k
a = 6k
b = 3k
c = 4k
a + b - c = 35
6k + 3k - 4k = 35
5k = 35
k = 7
a = 6k = 6(7) = 42
b = 3k = 3(7) = 21
a + b = 63