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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/11 = 84/x // - 84/x
6/11-(84/x) = 0
6/11-84*x^-1 = 0
-84*x^-1 = -6/11 // : -84
x^-1 = 1/154
-1 < 0
1/(x^1) = 1/154 // * x^1
1 = 1/154*x^1 // : 1/154
154 = x^1
x = 154
x = 154
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