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c in (-oo:+oo)
(3/4)*c+(1/2)*c = 1/7 // - 1/7
(3/4)*c+(1/2)*c-(1/7) = 0
(3/4)*c+(1/2)*c-1/7 = 0
5/4*c-1/7 = 0 // + 1/7
5/4*c = 1/7 // : 5/4
c = 1/7/5/4
c = 4/35
c = 4/35
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