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x+6:
y-3:
x*y=540..... (x+6)(y-3)=540..... xy-3x+6y-18=540
Depejo x*y=540... x= 540/y
remplazo.. xy-3x+6y-18=540 y me quedara 6y²-1620= y=30 x=18
30+6= 36
18-3=15
36*15=540