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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
15/x = 0.15 // - 0.15
15/x-0.15 = 0
15*x^-1 = 0.15 // : 15
x^-1 = 0.01
-1 < 0
1/(x^1) = 0.01 // * x^1
1 = 0.01*x^1 // : 0.01
100 = x^1
x = 100
x = 100
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