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x in (-oo:+oo)
a = (1/240)*x^40 // - (1/240)*x^40
a-((1/240)*x^40) = 0
a+(-1/240)*x^40 = 0
-1/240*x^40 = -a // : -1/240
x^40 = 240*a
x^40 = 240*a // ^ 1/40
abs(x) = 240^(1/40)*a^(1/40)
x = 240^(1/40)*a^(1/40) or x = -(240^(1/40)*a^(1/40))
x in { 240^(1/40)*a^(1/40), -(240^(1/40)*a^(1/40)) }
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