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4*y-(w^5*((8*x^5*y^4)/12)*y^3) = 0
(-2/3)*w^5*x^5*y^7+4*y = 0
-2/3*w^5*x^5*y^7 = -(4*y) // : -2/3*w^5*y^7
x^5 = 6*w^-5*y^-6
x^5 = 6*w^-5*y^-6 // ^ 1/5
x = 6^(1/5)*w^-1*y^(-6/5)
x = 6^(1/5)*w^-1*y^(-6/5)
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