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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2.5 = 170/x // - 170/x
2.5-(170/x) = 0
2.5-170*x^-1 = 0
-170*x^-1 = -2.5 // : -170
x^-1 = 0.01470588
-1 < 0
1/(x^1) = 0.01470588 // * x^1
1 = 0.01470588*x^1 // : 0.01470588
68.00001088 = x^1
x = 68.00001088
x = 68.00001088
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