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D( x )
x-3 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:+oo)
-3/(x-3) = 3 // - 3
-3/(x-3)-3 = 0
(-3*(x-3))/(x-3)-3/(x-3) = 0
-3*(x-3)-3 = 0
6-3*x = 0
(6-3*x)/(x-3) = 0
(6-3*x)/(x-3) = 0 // * x-3
6-3*x = 0
6-3*x = 0 // - 6
-3*x = -6 // : -3
x = -6/(-3)
x = 2
x = 2
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