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x in (-oo:+oo)
A = (240*x^240)/3 // - (240*x^240)/3
A-((240*x^240)/3) = 0
A-80*x^240 = 0
-80*x^240 = -A // : -80
x^240 = A/80
x^240 = A/80 // ^ 1/240
abs(x) = (A^(1/240))/(80^(1/240))
x = (A^(1/240))/(80^(1/240)) or x = -((A^(1/240))/(80^(1/240)))
x in { (A^(1/240))/(80^(1/240)), -((A^(1/240))/(80^(1/240))) }
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