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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x = 16/40 // - 16/40
2/x-(16/40) = 0
2/x-2/5 = 0
2*x^-1 = 2/5 // : 2
x^-1 = 1/5
-1 < 0
1/(x^1) = 1/5 // * x^1
1 = 1/5*x^1 // : 1/5
5 = x^1
x = 5
x = 5
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