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