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b-a = 15
b = 15+a
a+2(15+a) = 12
a+30+2a = 12
3a = 12-30
3a = -18
a = -18/3
a = -6
b = 15+a
b = 15-6
b = 9
Comprobación:
b-a = 15
9-(-6) = 15
9+6 = 15
Respuesta:
Los dos números son:
9 y -6