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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
15/8 = 45/c // - 45/c
15/8-(45/c) = 0
15/8-45*c^-1 = 0
-45*c^-1 = -15/8 // : -45
c^-1 = 1/24
-1 < 0
1/(c^1) = 1/24 // * c^1
1 = 1/24*c^1 // : 1/24
24 = c^1
c = 24
c = 24
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