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n in (-oo:+oo)
266 = (n^4)/3+10 // - (n^4)/3+10
266-((n^4)/3)-10 = 0
-1/3*n^4 = -256 // : -1/3
n^4 = 768
n^4 = 768 // ^ 1/4
abs(n) = 4*3^(1/4)
n = 4*3^(1/4) or n = -(4*3^(1/4))
n in { 4*3^(1/4), -(4*3^(1/4)) }
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