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D( x )
x-3 = 0
x^2-9 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x^2-9 = 0
x^2-9 = 0
1*x^2 = 9 // : 1
x^2 = 9
x^2 = 9 // ^ 1/2
abs(x) = 3
x = 3 or x = -3
x in (-oo:-3) U (-3:3) U (3:+oo)
(3*x)/(x^2-9)+2/(x-3) = 0
(3*x*(x-3))/((x^2-9)*(x-3))+(2*(x^2-9))/((x^2-9)*(x-3)) = 0
3*x*(x-3)+2*(x^2-9) = 0
5*x^2-9*x-18 = 0
5*x^2-9*x-18 = 0
5*x^2-9*x-18 = 0
DELTA = (-9)^2-(-18*4*5)
DELTA = 441
DELTA > 0
x = (441^(1/2)+9)/(2*5) or x = (9-441^(1/2))/(2*5)
x = 3 or x = -6/5
(x+6/5)*(x-3) = 0
((x+6/5)*(x-3))/((x^2-9)*(x-3)) = 0
((x+6/5)*(x-3))/((x^2-9)*(x-3)) = 0 // * (x^2-9)*(x-3)
(x+6/5)*(x-3) = 0
( x+6/5 )
x+6/5 = 0 // - 6/5
x = -6/5
( x-3 )
x-3 = 0 // + 3
x = 3
x in { 3}
x = -6/5
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