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12x+5y=40
Y=(40-12x) /5
2x=5/2y
Y=4/5x
Igualamos
(40-12x)/5=4/5x
40-12x=4x
X=40/16. ==>
X=5/2
Reemplazamos
2(5/2)=5/2y
Y=5*2/5 ==>.
y=2