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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
20-((x/(x^2))/3) = 0
(-1/3)*x^-1+20 = 0
-1/3*x^-1 = -20 // : -1/3
x^-1 = 60
-1 < 0
1/(x^1) = 60 // * x^1
1 = 60*x^1 // : 60
1/60 = x^1
x = 1/60
x = 1/60
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