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x in (-oo:+oo)
12 = x/y // - x/y
12-(x/y) = 0
x*(-y^-1)+12 = 0 // - 12
x*(-y^-1) = -12 // : -y^-1
x = -12/(-y^-1)
x = 12/(y^-1)
x = 12/(y^-1)
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