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