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36*x^4-y^2-((2/3)*y)-(1/9) = 0
36*x^4-y^2+(-2/3)*y-1/9 = 0
36*x^4 = -(-y^2-2/3*y-1/9) // : 36
x^4 = (y^2-(-2/3*y)+1/9)/36
x^4 = (y^2+2/3*y+1/9)/36 // ^ 1/4
abs(x) = ((y^2+2/3*y+1/9)^(1/4))/(36^(1/4))
x = ((y^2+2/3*y+1/9)^(1/4))/(36^(1/4)) or x = -(((y^2+2/3*y+1/9)^(1/4))/(36^(1/4)))
x in { ((y^2+2/3*y+1/9)^(1/4))/(36^(1/4)), -(((y^2+2/3*y+1/9)^(1/4))/(36^(1/4))) }
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