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x^2*((6*z^0*x^2*y^3)/(-7))*y^5*z^5 = 0
x^2*((6*x^2*y^3)/(-7))*y^5*z^5 = 0
-6/7*x^4*y^8*z^5 = 0 // : -6/7*y^8*z^5
x^4 = 0
x = 0
x = 0
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