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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
2/310 = 5/c // - 5/c
2/310-(5/c) = 0
2/310-5*c^-1 = 0
-5*c^-1 = -1/155 // : -5
c^-1 = 1/775
-1 < 0
1/(c^1) = 1/775 // * c^1
1 = 1/775*c^1 // : 1/775
775 = c^1
c = 775
c = 775
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