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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/2 = 11.7/x // - 11.7/x
1/2-(11.7/x) = 0
1/2-11.7*x^-1 = 0
-11.7*x^-1 = -1/2 // : -11.7
x^-1 = 0.04273504
-1 < 0
1/(x^1) = 0.04273504 // * x^1
1 = 0.04273504*x^1 // : 0.04273504
23.4000015 = x^1
x = 23.4000015
x = 23.4000015
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