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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/20 = 122/x // - 122/x
3/20-(122/x) = 0
3/20-122*x^-1 = 0
-122*x^-1 = -3/20 // : -122
x^-1 = 3/2440
-1 < 0
1/(x^1) = 3/2440 // * x^1
1 = 3/2440*x^1 // : 3/2440
2440/3 = x^1
x = 2440/3
x = 2440/3
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