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D( x )
9-x^2 = 0
3-x = 0
x+3 = 0
9-x^2 = 0
9-x^2 = 0
-1*x^2 = -9 // : -1
x^2 = 9
x^2 = 9 // ^ 1/2
abs(x) = 3
x = 3 or x = -3
3-x = 0
3-x = 0
3-x = 0 // - 3
-x = -3 // * -1
x = 3
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
x in (-oo:-3) U (-3:3) U (3:+oo)
2/(3-x)+1/(x+3)+1/(9-x^2) = 0
(2*(x+3)*(9-x^2))/((3-x)*(x+3)*(9-x^2))+(1*(3-x)*(9-x^2))/((3-x)*(x+3)*(9-x^2))+(1*(3-x)*(x+3))/((3-x)*(x+3)*(9-x^2)) = 0
2*(x+3)*(9-x^2)+1*(3-x)*(9-x^2)+1*(3-x)*(x+3) = 0
9*x-x^3-9*x^2-x^2+9+81 = 0
9*x-x^3-10*x^2+90 = 0
9*x-x^3-10*x^2+90 = 0
9*x-x^3-10*x^2+90
x*(9-x^2)-10*x^2+90
10*(9-x^2)+x*(9-x^2)
(x+10)*(9-x^2)
((x+10)*(9-x^2))/((3-x)*(x+3)*(9-x^2)) = 0
((x+10)*(9-x^2))/((3-x)*(x+3)*(9-x^2)) = 0 // * (3-x)*(x+3)*(9-x^2)
(x+10)*(9-x^2) = 0
( 9-x^2 )
-1*x^2 = -9 // : -1
x^2 = 9
x^2 = 9 // ^ 1/2
abs(x) = 3
x = 3 or x = -3
( x+10 )
x+10 = 0 // - 10
x = -10
x in { 3}
x in { -3}
x = -10
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