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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6331/x = 0.13 // - 0.13
6331/x-0.13 = 0
6331*x^-1 = 0.13 // : 6331
x^-1 = 0.00002053
-1 < 0
1/(x^1) = 0.00002053 // * x^1
1 = 0.00002053*x^1 // : 0.00002053
48709.20603994 = x^1
x = 48709.20603994
x = 48709.20603994
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