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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
76/57 = 57/x // - 57/x
76/57-(57/x) = 0
76/57-57*x^-1 = 0
-57*x^-1 = -4/3 // : -57
x^-1 = 4/171
-1 < 0
1/(x^1) = 4/171 // * x^1
1 = 4/171*x^1 // : 4/171
171/4 = x^1
x = 171/4
x = 171/4
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