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y: Otro numero
xy=12
x-y=5
x=5+y
(5+y)y=12
y²+5y=12
y²+5y-12=0
ay²+by+c=0
y=[-b+√(b²-4ac)]/2a ó y=[-b-√(b²-4ac)]/2a
y=[-5+√(5²-4(-12))]/2=1.77 ó y=-6.77
x=6.77 y=1.77