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c in (-oo:+oo)
(11/2)*c = 7-((1/2)*c) // - 7-((1/2)*c)
(11/2)*c+(1/2)*c-7 = 0
6*c-7 = 0 // + 7
6*c = 7 // : 6
c = 7/6
c = 7/6
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