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2*y-((x/4)*x^3*y)-y-(((3*x)/4)*x^3*y) = 0
2*y+(-1/4)*x^4*y-y+(-3/4)*x^4*y = 0
x^4*(-y) = -y // : -y
x^4 = 1
x^4 = 1 // ^ 1/4
abs(x) = 1
x = 1 or x = -1
x in { 1, -1 }
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