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