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D( x )
x-6 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x in (-oo:6) U (6:+oo)
(3*x^2-(10*x))/(x-6) = 0
(3*x^2-10*x)/(x-6) = 0
3*x^2-10*x = 0
x*(3*x-10) = 0
3*x-10 = 0 // + 10
3*x = 10 // : 3
x = 10/3
x*(x-10/3) = 0
(x*(x-10/3))/(x-6) = 0
( x-10/3 )
x-10/3 = 0 // + 10/3
x = 10/3
( x )
x = 0
x in { 10/3, 0 }
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