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c in (-oo:+oo)
(1/6)*c-5 = (-2/3)*c+9 // - (-2/3)*c+9
(1/6)*c-((-2/3)*c)-9-5 = 0
(1/6)*c+(2/3)*c-9-5 = 0
5/6*c-14 = 0 // + 14
5/6*c = 14 // : 5/6
c = 14/5/6
c = 84/5
c = 84/5
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