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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
120/4 = 340/x // - 340/x
120/4-(340/x) = 0
120/4-340*x^-1 = 0
-340*x^-1 = -30 // : -340
x^-1 = 3/34
-1 < 0
1/(x^1) = 3/34 // * x^1
1 = 3/34*x^1 // : 3/34
34/3 = x^1
x = 34/3
x = 34/3
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