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c in (-oo:+oo)
(5*c)/8-c-3 = (5*c)/6-13 // - (5*c)/6-13
(5*c)/8-c-((5*c)/6)-3+13 = 0
(5*c)/8-c+(-5/6)*c-3+13 = 0
10-29/24*c = 0 // - 10
-29/24*c = -10 // : -29/24
c = -10/(-29/24)
c = 240/29
c = 240/29
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