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x in (-oo:+oo)
(((5*x^5)/2)*y^10)^5*(x*((2^2*y^3)/(5^3))-2) = 0
3125/32*x^25*y^50*(4/125*x*y^3-2) = 0
( 3125/32*x^25*y^50 )
3125/32*x^25*y^50 = 0 // : 3125/32*y^50
x^25 = 0
x = 0
( 4/125*x*y^3-2 )
4/125*x*y^3-2 = 0 // + 2
4/125*x*y^3 = 2 // : 4/125*y^3
x = 2/(4/125*y^3)
x = 125/2*y^-3
x in { 0, 125/2*y^-3 }
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