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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3/x = 0.15 // - 0.15
3/x-0.15 = 0
3*x^-1 = 0.15 // : 3
x^-1 = 0.05
-1 < 0
1/(x^1) = 0.05 // * x^1
1 = 0.05*x^1 // : 0.05
20 = x^1
x = 20
x = 20
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