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x in (-oo:+oo)
x/y = x-(5*y)-8 // - x-(5*y)-8
x/y-x+5*y+8 = 0
x*y^-1+5*y+8 = 0 // - 5*y+8
x*y^-1 = -(5*y+8) // : y^-1
x = (-(5*y+8))/(y^-1)
x = -(y*(5*y+8))
x = -(y*(5*y+8))
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