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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x = 42/92 // - 42/92
4/x-(42/92) = 0
4/x-21/46 = 0
4*x^-1 = 21/46 // : 4
x^-1 = 21/184
-1 < 0
1/(x^1) = 21/184 // * x^1
1 = 21/184*x^1 // : 21/184
184/21 = x^1
x = 184/21
x = 184/21
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