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