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D( x )
x^2*(x-18) = 0
x^2*(x-18) = 0
x^2*(x-18) = 0
( x-18 )
x-18 = 0 // + 18
x = 18
( x^2 )
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:18) U (18:+oo)
(x+6)/(x^2*(x-18)) = 0
x+6 = 0 // - 6
x = -6
x = -6
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