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25*x-(x^5*y^2*((5*y^4)/35)) = 0
25*x+(-1/7)*x^5*y^6 = 0
25*x-1/7*x^5*y^6 = 0
x*(25-1/7*x^4*y^6) = 0
-1/7*x^4*y^6 = -25 // : -1/7*y^6
x^4 = 175*y^-6
x^4 = 175*y^-6 // ^ 1/4
abs(x) = 175^(1/4)*y^(-3/2)
x = 175^(1/4)*y^(-3/2) or x = -(175^(1/4)*y^(-3/2))
x = 0
x = 0
x in { 175^(1/4)*y^(-3/2), -(175^(1/4)*y^(-3/2)), 0 }
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