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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15.5/x = 0.7 // - 0.7
15.5/x-0.7 = 0
15.5*x^-1 = 0.7 // : 15.5
x^-1 = 0.04516129
-1 < 0
1/(x^1) = 0.04516129 // * x^1
1 = 0.04516129*x^1 // : 0.04516129
22.1428573 = x^1
x = 22.1428573
x = 22.1428573
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