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