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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
154/x = 4/3 // - 4/3
154/x-(4/3) = 0
154/x-4/3 = 0
154*x^-1 = 4/3 // : 154
x^-1 = 2/231
-1 < 0
1/(x^1) = 2/231 // * x^1
1 = 2/231*x^1 // : 2/231
231/2 = x^1
x = 231/2
x = 231/2
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