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