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x in (-oo:+oo)
x-(a/b) = z // - z
x-(a/b)-z = 0
x-(a*b^-1)-z = 0 // + -(a*b^-1)-z
x = -(-(a*b^-1)-z)
x = a*b^-1+z
x = a*b^-1+z
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