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c in (-oo:+oo)
7/20 = c+2/5 // - c+2/5
7/20-c-(2/5) = 0
7/20-c-2/5 = 0
-c-1/20 = 0 // + 1/20
-c = 1/20 // * -1
c = -1/20
c = -1/20
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