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x in (-oo:+oo)
Y = x*((7*x^3)/4) // - x*((7*x^3)/4)
Y-(x*((7*x^3)/4)) = 0
Y+(-7/4)*x^4 = 0
-7/4*x^4 = -Y // : -7/4
x^4 = 4/7*Y
x^4 = 4/7*Y // ^ 1/4
abs(x) = (4/7)^(1/4)*Y^(1/4)
x = (4/7)^(1/4)*Y^(1/4) or x = -((4/7)^(1/4)*Y^(1/4))
x in { (4/7)^(1/4)*Y^(1/4), -((4/7)^(1/4)*Y^(1/4)) }
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