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b+12 = a-12 ec. 2
Sustituyendo valores de la ec. 1 en la ec 2:
b+12 = (2b) -12
b+12 = 2b-12
b-2b = -12-12
-b =-24
b = 24
De la ec. 1:
a = 2b
a = 2*24
a = 48
48-12 = 36
24+12 = 36 comprobado
Por tanto:
a = 48
b = 24
Saludos.......