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c in (-oo:+oo)
(6/3)*c = 2/3 // - 2/3
(6/3)*c-(2/3) = 0
(6/3)*c-2/3 = 0
2*c-2/3 = 0 // + 2/3
2*c = 2/3 // : 2
c = 2/3/2
c = 1/3
c = 1/3
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