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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/60 = 3.5/x // - 3.5/x
6/60-(3.5/x) = 0
6/60-3.5*x^-1 = 0
-3.5*x^-1 = -1/10 // : -3.5
x^-1 = 0.02857143
-1 < 0
1/(x^1) = 0.02857143 // * x^1
1 = 0.02857143*x^1 // : 0.02857143
34.99999825 = x^1
x = 34.99999825
x = 34.99999825
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