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c in (-oo:+oo)
(13/4)*c-(11/2) = 63/4 // - 63/4
(13/4)*c-(11/2)-(63/4) = 0
(13/4)*c-11/2-63/4 = 0
13/4*c-85/4 = 0 // + 85/4
13/4*c = 85/4 // : 13/4
c = 85/4/13/4
c = 85/13
c = 85/13
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