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c in (-oo:+oo)
(4/5)*(5*c-10) = 24 // - 24
(4/5)*(5*c-10)-24 = 0
4/5*(5*c-10)-24 = 0
4/5*(5*c-10)-24 = 0
4*c-32 = 0
4*c-32 = 0
4*c-32 = 0 // + 32
4*c = 32 // : 4
c = 32/4
c = 8
c = 8
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