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x in (-oo:+oo)
(1/2)*x*x^5*y^7*z = (-5/3)*x^7*y^9*z^3 // - (-5/3)*x^7*y^9*z^3
(1/2)*x*x^5*y^7*z-((-5/3)*x^7*y^9*z^3) = 0
(5/3)*x^7*y^9*z^3+(1/2)*x*x^5*y^7*z = 0
5/3*x^7*y^9*z^3+1/2*x^6*y^7*z = 0
x^6*y^7*z*(5/3*x*y^2*z^2+1/2) = 0
5/3*x*y^2*z^2+1/2 = 0 // - 1/2
5/3*x*y^2*z^2 = -1/2 // : 5/3*y^2*z^2
x = -1/2/(5/3*y^2*z^2)
x = -3/10*y^-2*z^-2
x^6*y^7*z = 0
x^6*y^7*z = 0 // : y^7*z
x^6 = 0
x = 0
x in { -3/10*y^-2*z^-2, 0 }
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