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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
50 = 15/c // - 15/c
50-(15/c) = 0
50-15*c^-1 = 0
-15*c^-1 = -50 // : -15
c^-1 = 10/3
-1 < 0
1/(c^1) = 10/3 // * c^1
1 = 10/3*c^1 // : 10/3
3/10 = c^1
c = 3/10
c = 3/10
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