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D( x )
x+6 = 0
x+3 = 0
x+6 = 0
x+6 = 0
x+6 = 0 // - 6
x = -6
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
x in (-oo:-6) U (-6:-3) U (-3:+oo)
3/(x+3) = x/(x+6) // - x/(x+6)
3/(x+3)-(x/(x+6)) = 0
3/(x+3)+(-1*x)/(x+6) = 0
(3*(x+6))/((x+3)*(x+6))+(-1*x*(x+3))/((x+3)*(x+6)) = 0
3*(x+6)-1*x*(x+3) = 0
18-x^2 = 0
(18-x^2)/((x+3)*(x+6)) = 0
(18-x^2)/((x+3)*(x+6)) = 0 // * (x+3)*(x+6)
18-x^2 = 0
-1*x^2 = -18 // : -1
x^2 = 18
x^2 = 18 // ^ 1/2
abs(x) = 3*2^(1/2)
x = 3*2^(1/2) or x = -(3*2^(1/2))
x in { 3*2^(1/2), -(3*2^(1/2)) }
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