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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((m*x^-8)/9)*z^-6 = 0
1/9*m*x^-8*z^-6 = 0 // : 1/9*m*z^-6
x^-8 = 0
x naleu017Cy do O
x belongs to the empty set
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