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x in (-oo:+oo)
120-((40/4)*x^6) = 0
120-10*x^6 = 0
-10*x^6 = -120 // : -10
x^6 = 12
x^6 = 12 // ^ 1/6
abs(x) = 12^(1/6)
x = 12^(1/6) or x = -12^(1/6)
x in { 12^(1/6), -12^(1/6) }
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