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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^8*y^-6*((12*x^-5*y^3*z^-7)/6) = 0
2*x^3*y^-3*z^-7 = 0 // : 2*y^-3*z^-7
x^3 = 0
x = 0
x in { 0}
x belongs to the empty set
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