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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14/x = 0.5 // - 0.5
14/x-0.5 = 0
14*x^-1 = 0.5 // : 14
x^-1 = 0.03571429
-1 < 0
1/(x^1) = 0.03571429 // * x^1
1 = 0.03571429*x^1 // : 0.03571429
27.99999664 = x^1
x = 27.99999664
x = 27.99999664
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