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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
-8/x = 1/10-(9/10) // - 1/10-(9/10)
9/10-8/x-(1/10) = 0
9/10-8/x-1/10 = 0
-8*x^-1 = -4/5 // : -8
x^-1 = 1/10
-1 < 0
1/(x^1) = 1/10 // * x^1
1 = 1/10*x^1 // : 1/10
10 = x^1
x = 10
x = 10
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