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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
657473/x = 0.333333333333334 // - 0.333333333333334
657473/x-0.333333333333334 = 0
657473*x^-1 = 0.333333333333334 // : 657473
x^-1 = 0.00000051
-1 < 0
1/(x^1) = 0.00000051 // * x^1
1 = 0.00000051*x^1 // : 0.00000051
1960784.31372549 = x^1
x = 1960784.31372549
x = 1960784.31372549
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