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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.5 = 10/x // - 10/x
0.5-(10/x) = 0
0.5-10*x^-1 = 0
-10*x^-1 = -0.5 // : -10
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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