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b = (1/2)a
c = 28 - a
a + (1/2)a + 28 - a = -3
(1/2)a = -31
a = -62
b = (1/2)(-62) = -31
c = 28 - (-62)
c = 90
Por tanto los números son
a = -62
b = -31
c = 90