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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
21.6/x = 0.35 // - 0.35
21.6/x-0.35 = 0
21.6*x^-1 = 0.35 // : 21.6
x^-1 = 0.0162037
-1 < 0
1/(x^1) = 0.0162037 // * x^1
1 = 0.0162037*x^1 // : 0.0162037
61.71429982 = x^1
x = 61.71429982
x = 61.71429982
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