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c in (-oo:+oo)
(2/9)*c+(1/3)*c = 1/4 // - 1/4
(2/9)*c+(1/3)*c-(1/4) = 0
(2/9)*c+(1/3)*c-1/4 = 0
5/9*c-1/4 = 0 // + 1/4
5/9*c = 1/4 // : 5/9
c = 1/4/5/9
c = 9/20
c = 9/20
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