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c in (-oo:+oo)
5-((4*c)/7) = 8 // - 8
5-((4*c)/7)-8 = 0
(-4/7)*c-8+5 = 0
-4/7*c-3 = 0 // + 3
-4/7*c = 3 // : -4/7
c = 3/(-4/7)
c = -21/4
c = -21/4
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