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c in (-oo:+oo)
23/4-c = 31/3 // - 31/3
23/4-c-(31/3) = 0
23/4-c-31/3 = 0
-c-55/12 = 0 // + 55/12
-c = 55/12 // * -1
c = -55/12
c = -55/12
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