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y in (-oo:+oo)
(3*y^4)/4 = (y^6)/16 // - (y^6)/16
(3*y^4)/4-((y^6)/16) = 0
3/4*y^4-1/16*y^6 = 0
1/4*y^4*(3-1/4*y^2) = 0
-1/4*y^2 = -3 // : -1/4
y^2 = 12
y^2 = 12 // ^ 1/2
abs(y) = 2*3^(1/2)
y = 2*3^(1/2) or y = -(2*3^(1/2))
(y^4)/4 = 0
1/4*y^4 = 0 // : 1/4
y^4 = 0
y = 0
y in { 2*3^(1/2), -(2*3^(1/2)), 0 }
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