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c in (-oo:+oo)
2.5/5 = c/8 // - c/8
2.5/5-(c/8) = 0
0.5-1/8*c = 0 // - 0.5
-1/8*c = -0.5 // : -1/8
c = -0.5/(-1/8)
c = 4
c = 4
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