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D( x )
2*x-6 = 0
2*x-6 = 0
2*x-6 = 0
2*x-6 = 0 // + 6
2*x = 6 // : 2
x = 6/2
x = 3
x in (-oo:3) U (3:+oo)
(3*x^2-(9*x))/(2*x-6) = 0
(3*x^2-9*x)/(2*x-6) = 0
3*x^2-9*x = 0
3*x*(x-3) = 0
x-3 = 0 // + 3
x = 3
3*x*(x-3) = 0
(3*x*(x-3))/(2*x-6) = 0
( 3*x )
3*x = 0 // : 3
x = 0
( x-3 )
x-3 = 0 // + 3
x = 3
x in { 3}
x = 0
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