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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
7.38/c = 0.82 // - 0.82
7.38/c-0.82 = 0
7.38*c^-1 = 0.82 // : 7.38
c^-1 = 0.11111111
-1 < 0
1/(c^1) = 0.11111111 // * c^1
1 = 0.11111111*c^1 // : 0.11111111
9.00000009 = c^1
c = 9.00000009
c = 9.00000009
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