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x*((5*x^5*y^-8)/25)*y^-7-4 = 0
1/5*x^6*y^-15 = 4 // : 1/5*y^-15
x^6 = 20*y^15
x^6 = 20*y^15 // ^ 1/6
abs(x) = 20^(1/6)*y^(5/2)
x = 20^(1/6)*y^(5/2) or x = -(20^(1/6)*y^(5/2))
x in { 20^(1/6)*y^(5/2), -(20^(1/6)*y^(5/2)) }
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