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x in (-oo:+oo)
1-((7*x^6)/7) = 0
1-x^6 = 0
-1*x^6 = -1 // : -1
x^6 = 1
x^6 = 1 // ^ 1/6
abs(x) = 1
x = 1 or x = -1
x in { 1, -1 }
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