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c in (-oo:+oo)
(5/6)*c+(1/3)*c = 4/7 // - 4/7
(5/6)*c+(1/3)*c-(4/7) = 0
(5/6)*c+(1/3)*c-4/7 = 0
7/6*c-4/7 = 0 // + 4/7
7/6*c = 4/7 // : 7/6
c = 4/7/7/6
c = 24/49
c = 24/49
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