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c in (-oo:+oo)
7*c = 3/5 // - 3/5
7*c-(3/5) = 0
7*c-3/5 = 0
7*c-3/5 = 0 // + 3/5
7*c = 3/5 // : 7
c = 3/5/7
c = 3/35
c = 3/35
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