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c in (-oo:+oo)
(5/14)*c-(9/2) = 8/7 // - 8/7
(5/14)*c-(9/2)-(8/7) = 0
(5/14)*c-9/2-8/7 = 0
5/14*c-79/14 = 0 // + 79/14
5/14*c = 79/14 // : 5/14
c = 79/14/5/14
c = 79/5
c = 79/5
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