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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
7.2/4.8 = 20.4/c // - 20.4/c
7.2/4.8-(20.4/c) = 0
7.2/4.8-20.4*c^-1 = 0
-20.4*c^-1 = -1.5 // : -20.4
c^-1 = 0.07352941
-1 < 0
1/(c^1) = 0.07352941 // * c^1
1 = 0.07352941*c^1 // : 0.07352941
13.60000033 = c^1
c = 13.60000033
c = 13.60000033
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