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igualas a cero
ec.2 ab-2a-4b=0
factorizas a de la ec.2
a(b-2)-4b=0
despejas a
a=4b/(b-2)
ahora factorizas b de la ec.2
b(a-4)-2a=0
b=2a/(a-4)
ahora a+b=
(4b/(b-2))+(2a/(a-4))