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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x = 6/684 // - 6/684
5/x-(6/684) = 0
5/x-1/114 = 0
5*x^-1 = 1/114 // : 5
x^-1 = 1/570
-1 < 0
1/(x^1) = 1/570 // * x^1
1 = 1/570*x^1 // : 1/570
570 = x^1
x = 570
x = 570
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