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D( x )
x^4*((2*x-22)/6) = 0
x^4*((2*x-22)/6) = 0
x^4*((2*x-22)/6) = 0
(x^4*(2*x-22))/6 = 0
( 2*x-22 )
2*x-22 = 0 // + 22
2*x = 22 // : 2
x = 22/2
x = 11
( x^4 )
1*x^4 = 0 // : 1
x^4 = 0
x = 0
x in (-oo:0) U (0:11) U (11:+oo)
(x^3*(((x-11)*(x+8))/3))/(x^4*((2*x-22)/6)) = 0
(6*x^3*(x-11)*(x+8))/(3*x^4*(2*x-22)) = 0
( x+8 )
x+8 = 0 // - 8
x = -8
( x-11 )
x-11 = 0 // + 11
x = 11
( x^3 )
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in { 11}
x in { 0}
x = -8
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