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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
2.1/c = 1.5/1.4 // - 1.5/1.4
2.1/c-(1.5/1.4) = 0
2.1/c-1.07142857 = 0
2.1*c^-1 = 1.07142857 // : 2.1
c^-1 = 0.51020408
-1 < 0
1/(c^1) = 0.51020408 // * c^1
1 = 0.51020408*c^1 // : 0.51020408
1.96000001 = c^1
c = 1.96000001
c = 1.96000001
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