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x^3*y^5*((20*x^4*y^7+16*x^5*y^6)/4) = 0
(x^3*y^5*(20*x^4*y^7+16*x^5*y^6))/4 = 0
20*x^4*y^7+16*x^5*y^6 = 0
4*x^4*y^6*(4*x+5*y) = 0
4*x+5*y = 0 // - 5*y
4*x = -(5*y) // : 4
x = (-(5*y))/4
x = (-5*y)/4
4*x^4*y^6*(x+5/4*y) = 0
(4*x^3*x^4*y^5*y^6*(x+5/4*y))/4 = 0
( 4*x^4*y^6 )
4*x^4*y^6 = 0 // : 4*y^6
x^4 = 0
x = 0
( x+5/4*y )
x+5/4*y = 0 // - 5/4*y
x = -(5/4*y)
x = -5/4*y
( x^3*y^5 )
x^3*y^5 = 0 // : y^5
x^3 = 0
x = 0
x in { 0, -5/4*y, 0 }
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