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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
2.5/5 = 8/c // - 8/c
2.5/5-(8/c) = 0
2.5/5-8*c^-1 = 0
-8*c^-1 = -0.5 // : -8
c^-1 = 0.0625
-1 < 0
1/(c^1) = 0.0625 // * c^1
1 = 0.0625*c^1 // : 0.0625
16 = c^1
c = 16
c = 16
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