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D( x )
x-3 = 0
x+3 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
x in (-oo:-3) U (-3:3) U (3:+oo)
6/(x+3) = 4/(x-3) // - 4/(x-3)
6/(x+3)-(4/(x-3)) = 0
6/(x+3)-4*(x-3)^-1 = 0
6/(x+3)-4/(x-3) = 0
(6*(x-3))/((x+3)*(x-3))+(-4*(x+3))/((x+3)*(x-3)) = 0
6*(x-3)-4*(x+3) = 0
2*x-30 = 0
(2*x-30)/((x+3)*(x-3)) = 0
(2*x-30)/((x+3)*(x-3)) = 0 // * (x+3)*(x-3)
2*x-30 = 0
2*x-30 = 0 // + 30
2*x = 30 // : 2
x = 30/2
x = 15
x = 15
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