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c in (-oo:+oo)
20 = c+c-(2/8) // - c+c-(2/8)
2/8-c-c+20 = 0
81/4-2*c = 0 // - 81/4
-2*c = -81/4 // : -2
c = -81/4/(-2)
c = 81/8
c = 81/8
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