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c in (-oo:+oo)
(3/4)*c-7 = 7-((1/8)*c) // - 7-((1/8)*c)
(3/4)*c+(1/8)*c-7-7 = 0
7/8*c-14 = 0 // + 14
7/8*c = 14 // : 7/8
c = 14/7/8
c = 16
c = 16
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