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c in (-oo:+oo)
(8/3)*c-(2*c) = (2/3)*c-12 // - (2/3)*c-12
(8/3)*c-(2*c)-((2/3)*c)+12 = 0
(8/3)*c-2*c+(-2/3)*c+12 = 0
12 = 0
c belongs to the empty set
c belongs to the empty set
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