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X in (-oo:+oo)
16*X^4-(1/81) = 0
16*X^4-1/81 = 0
16*X^4 = 1/81 // : 16
X^4 = 1/1296
X^4 = 1/1296 // ^ 1/4
abs(X) = 1/6
X = 1/6 or X = -1/6
X in { 1/6, -1/6 }
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