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x^1*y^7*((12*x^5*x^12*y^4*z^2)/18)*z^2 = 0
x*y^7*((12*x^5*x^12*y^4*z^2)/18)*z^2 = 0
2/3*x^18*y^11*z^4 = 0 // : 2/3*y^11*z^4
x^18 = 0
x = 0
x = 0
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