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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
45/6 = 120/c // - 120/c
45/6-(120/c) = 0
45/6-120*c^-1 = 0
-120*c^-1 = -15/2 // : -120
c^-1 = 1/16
-1 < 0
1/(c^1) = 1/16 // * c^1
1 = 1/16*c^1 // : 1/16
16 = c^1
c = 16
c = 16
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