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c in (-oo:+oo)
(1/2)*c-(1/4) = -2/4 // + -2/4
(1/2)*c-(1/4)-(-2/4) = 0
(1/2)*c-1/4+1/2 = 0
1/2*c+1/4 = 0 // - 1/4
1/2*c = -1/4 // : 1/2
c = -1/4/1/2
c = -1/2
c = -1/2
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