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x in (-oo:+oo)
5*y-(x/(-y)) = 0
5*y+x*y^-1 = 0
x*y^-1+5*y = 0 // - 5*y
x*y^-1 = -(5*y) // : y^-1
x = (-(5*y))/(y^-1)
x = -5*y^2
x = -5*y^2
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