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c in (-oo:+oo)
(9/8)*c-(2*c) = 13 // - 13
(9/8)*c-(2*c)-13 = 0
(9/8)*c-2*c-13 = 0
-7/8*c-13 = 0 // + 13
-7/8*c = 13 // : -7/8
c = 13/(-7/8)
c = -104/7
c = -104/7
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