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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)
x/x-(10/x)-10+10 = (20*x)/(x^2)-100 // - (20*x)/(x^2)-100
x/x-(10/x)-((20*x)/(x^2))-10+10+100 = 0
x/x-10*x^-1-20*x^-1-10+10+100 = 0
-30*x^-1 = -101 // : -30
x^-1 = 101/30
-1 < 0
1/(x^1) = 101/30 // * x^1
1 = 101/30*x^1 // : 101/30
30/101 = x^1
x = 30/101
x = 30/101
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