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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)
3/x-((4*x)/(x^2))-10+100 = 4/x+10 // - 4/x+10
3/x-((4*x)/(x^2))-(4/x)-10-10+100 = 0
3/x-4*x^-1-4*x^-1-10-10+100 = 0
-5*x^-1 = -80 // : -5
x^-1 = 16
-1 < 0
1/(x^1) = 16 // * x^1
1 = 16*x^1 // : 16
1/16 = x^1
x = 1/16
x = 1/16
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