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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5 = 340/x // - 340/x
5-(340/x) = 0
5-340*x^-1 = 0
-340*x^-1 = -5 // : -340
x^-1 = 1/68
-1 < 0
1/(x^1) = 1/68 // * x^1
1 = 1/68*x^1 // : 1/68
68 = x^1
x = 68
x = 68
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