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c in (-oo:+oo)
-20-6 = c/(-2) // - c/(-2)
-(c/(-2))-20-6 = 0
1/2*c-26 = 0 // + 26
1/2*c = 26 // : 1/2
c = 26/1/2
c = 52
c = 52
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