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c in (-oo:+oo)
6*(8-((4*c)/5)) = 0
6*((-4/5)*c+8) = 0
6*(8-4/5*c) = 0
8-4/5*c = 0 // - 8
-4/5*c = -8 // : -4/5
c = -8/(-4/5)
c = 10
c = 10
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