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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)+10 // - (20*x)/(x+20)+10
x-((20*x)/(x+20))-10 = 0
x-20*x*(x+20)^-1-10 = 0
(-20*x)/(x+20)+x-10 = 0
(-20*x)/(x+20)+(x*(x+20))/(x+20)+(-10*(x+20))/(x+20) = 0
x*(x+20)-10*(x+20)-20*x = 0
x^2-10*x-200 = 0
x^2-10*x-200 = 0
x^2-10*x-200 = 0
DELTA = (-10)^2-(-200*1*4)
DELTA = 900
DELTA > 0
x = (900^(1/2)+10)/(1*2) or x = (10-900^(1/2))/(1*2)
x = 20 or x = -10
(x+10)*(x-20) = 0
((x+10)*(x-20))/(x+20) = 0
((x+10)*(x-20))/(x+20) = 0 // * x+20
(x+10)*(x-20) = 0
( x+10 )
x+10 = 0 // - 10
x = -10
( x-20 )
x-20 = 0 // + 20
x = 20
x in { -10, 20 }
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