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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15.8/x = 0.7 // - 0.7
15.8/x-0.7 = 0
15.8*x^-1 = 0.7 // : 15.8
x^-1 = 0.0443038
-1 < 0
1/(x^1) = 0.0443038 // * x^1
1 = 0.0443038*x^1 // : 0.0443038
22.57142728 = x^1
x = 22.57142728
x = 22.57142728
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