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