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c in (-oo:+oo)
(5/2)*c = 81/3 // - 81/3
(5/2)*c-(81/3) = 0
(5/2)*c-27 = 0
5/2*c-27 = 0 // + 27
5/2*c = 27 // : 5/2
c = 27/5/2
c = 54/5
c = 54/5
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