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D( x )
x+2 = 0
x-4 = 0
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x-4 = 0
x-4 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:-2) U (-2:4) U (4:+oo)
(3*x)/(x+2)-(9/(x-4)) = 3 // - 3
(3*x)/(x+2)-(9/(x-4))-3 = 0
(3*x)/(x+2)-9*(x-4)^-1-3 = 0
(3*x)/(x+2)-9/(x-4)-3 = 0
(3*x*(x-4))/((x+2)*(x-4))+(-9*(x+2))/((x+2)*(x-4))+(-3*(x+2)*(x-4))/((x+2)*(x-4)) = 0
3*x*(x-4)-9*(x+2)-3*(x+2)*(x-4) = 0
3*x^2-3*x^2-21*x+6*x-18+24 = 0
6-15*x = 0
(6-15*x)/((x+2)*(x-4)) = 0
(6-15*x)/((x+2)*(x-4)) = 0 // * (x+2)*(x-4)
6-15*x = 0
6-15*x = 0 // - 6
-15*x = -6 // : -15
x = -6/(-15)
x = 2/5
x = 2/5
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