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c in (-oo:+oo)
(3/5)*c = 25/4 // - 25/4
(3/5)*c-(25/4) = 0
(3/5)*c-25/4 = 0
3/5*c-25/4 = 0 // + 25/4
3/5*c = 25/4 // : 3/5
c = 25/4/3/5
c = 125/12
c = 125/12
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