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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
4/x = 150/99 // - 150/99
4/x-(150/99) = 0
4/x-50/33 = 0
4*x^-1 = 50/33 // : 4
x^-1 = 25/66
-1 < 0
1/(x^1) = 25/66 // * x^1
1 = 25/66*x^1 // : 25/66
66/25 = x^1
x = 66/25
x = 66/25
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