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D( x )
x = 0
x^2 = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
11/x-((10*x)/(x^2))-100+10 = 0
11/x-10*x^-1-100+10 = 0
1*x^-1 = 90 // : 1
x^-1 = 90
-1 < 0
1/(x^1) = 90 // * x^1
1 = 90*x^1 // : 90
1/90 = x^1
x = 1/90
x = 1/90
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