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c in (-oo:+oo)
6*c = 4/5 // - 4/5
6*c-(4/5) = 0
6*c-4/5 = 0
6*c-4/5 = 0 // + 4/5
6*c = 4/5 // : 6
c = 4/5/6
c = 2/15
c = 2/15
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