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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/10.5 = 10/x // - 10/x
3/10.5-(10/x) = 0
3/10.5-10*x^-1 = 0
-10*x^-1 = -0.28571429 // : -10
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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