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D( x )
16*x^7*y^6 = 0
16*x^7*y^6 = 0
16*x^7*y^6 = 0
16*x^7*y^6 = 0 // : 16*y^6
x^7 = 0
x = 0
x in (-oo:0) U (0:+oo)
(-28*x^3*y^5)/(16*x^7*y^6) = 0
-7/4*x^-4*y^-1 = 0 // : -7/4*y^-1
x^-4 = 0
x naleu017Cy do O
x belongs to the empty set
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