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c in (-oo:+oo)
(13/2)*c = 7-((1/2)*c) // - 7-((1/2)*c)
(13/2)*c+(1/2)*c-7 = 0
7*c-7 = 0 // + 7
7*c = 7 // : 7
c = 7/7
c = 1
c = 1
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