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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
120/20 = 93/x // - 93/x
120/20-(93/x) = 0
120/20-93*x^-1 = 0
-93*x^-1 = -6 // : -93
x^-1 = 2/31
-1 < 0
1/(x^1) = 2/31 // * x^1
1 = 2/31*x^1 // : 2/31
31/2 = x^1
x = 31/2
x = 31/2
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