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c in (-oo:+oo)
(5/2)*c = 1/2 // - 1/2
(5/2)*c-(1/2) = 0
(5/2)*c-1/2 = 0
5/2*c-1/2 = 0 // + 1/2
5/2*c = 1/2 // : 5/2
c = 1/2/5/2
c = 1/5
c = 1/5
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