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x in (-oo:+oo)
x = (88/40)*x^4 // - (88/40)*x^4
x-((88/40)*x^4) = 0
(-11/5)*x^4+x = 0
x-11/5*x^4 = 0
x*(1-11/5*x^3) = 0
-11/5*x^3 = -1 // : -11/5
x^3 = 5/11
x^3 = 5/11 // ^ 1/3
x = (5/11)^(1/3)
x = 0
x = 0
x in { (5/11)^(1/3), 0 }
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