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