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