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x in (-oo:+oo)
Y = (-7/4)*x^3 // - (-7/4)*x^3
Y-((-7/4)*x^3) = 0
Y+(7/4)*x^3 = 0
7/4*x^3 = -Y // : 7/4
x^3 = -4/7*Y
x^3 = -4/7*Y // ^ 1/3
x = -(4/7)^(1/3)*Y^(1/3)
x = -(4/7)^(1/3)*Y^(1/3)
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