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x^6*((4*z^0*x^6*y^4)/(-5))*y^9*z^5 = 0
x^6*((4*x^6*y^4)/(-5))*y^9*z^5 = 0
-4/5*x^12*y^13*z^5 = 0 // : -4/5*y^13*z^5
x^12 = 0
x = 0
x = 0
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