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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
4.7/c = 2.96/4.4 // - 2.96/4.4
4.7/c-(2.96/4.4) = 0
4.7/c-0.67272727 = 0
4.7*c^-1 = 0.67272727 // : 4.7
c^-1 = 0.14313346
-1 < 0
1/(c^1) = 0.14313346 // * c^1
1 = 0.14313346*c^1 // : 0.14313346
6.9864866 = c^1
c = 6.9864866
c = 6.9864866
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