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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.17 = 23/x // - 23/x
0.17-(23/x) = 0
0.17-23*x^-1 = 0
-23*x^-1 = -0.17 // : -23
x^-1 = 0.0073913
-1 < 0
1/(x^1) = 0.0073913 // * x^1
1 = 0.0073913*x^1 // : 0.0073913
135.29419723 = x^1
x = 135.29419723
x = 135.29419723
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