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c in (-oo:+oo)
325/50 = c/2 // - c/2
325/50-(c/2) = 0
13/2-1/2*c = 0 // - 13/2
-1/2*c = -13/2 // : -1/2
c = -13/2/(-1/2)
c = 13
c = 13
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