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c in (-oo:+oo)
(3/2)*c = 81/10 // - 81/10
(3/2)*c-(81/10) = 0
(3/2)*c-81/10 = 0
3/2*c-81/10 = 0 // + 81/10
3/2*c = 81/10 // : 3/2
c = 81/10/3/2
c = 27/5
c = 27/5
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