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c in (-oo:+oo)
9-c-3 = 1/4 // - 1/4
9-c-(1/4)-3 = 0
9-c-1/4-3 = 0
23/4-c = 0 // - 23/4
-c = -23/4 // * -1
c = 23/4
c = 23/4
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