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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(((b^5*x*((2*x^5)/9))/x)/6)*b^3 = 0
1/27*b^8*x^5 = 0 // : 1/27*b^8
x^5 = 0
x = 0
x in { 0}
x belongs to the empty set
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