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a=12-b
a+2b-3=12
reemplazando "a"
12-b+2b-3=12
9+b=12
b=12-9
b=3
a+b=12
a+3=12
a=9
halla: (a x a x a) + (b x b x b)
9x9x9 + 3 x 3 x3
81 x 9 + 27
729+27
756