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