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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8*w^7*x^-5*y^3*z^-9-(2/3) = 0
8*w^7*x^-5*y^3*z^-9-2/3 = 0
8*w^7*x^-5*y^3*z^-9 = 2/3 // : 8*w^7*y^3*z^-9
x^-5 = 1/12*w^-7*y^-3*z^9
-5 < 0
1/(x^5) = 1/12*w^-7*y^-3*z^9 // * x^5
1 = 1/12*w^-7*x^5*y^-3*z^9 // : 1/12*w^-7*y^-3*z^9
12*w^7*y^3*z^-9 = x^5
x^5 = 12*w^7*y^3*z^-9 // ^ 1/5
x = 12^(1/5)*w^(7/5)*y^(3/5)*z^(-9/5)
x = 12^(1/5)*w^(7/5)*y^(3/5)*z^(-9/5)
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