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2014-05-27T20:22:05+03:00
X*y=3 => x=3/y

3/y+y=-4
3+y^2=-4y
y^2+4y+3=0

D=16-12=4
y1=-4+2=-2  => x1=-3/2
y2=-4-2=-6   => x2=-3/6=-1/2