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5/6-((1/12)*x^4) = 0
(-1/12)*x^4+5/6 = 0
-1/12*x^4 = -5/6 // : -1/12
x^4 = 10
x^4 = 10 // ^ 1/4
abs(x) = 10^(1/4)
x = 10^(1/4) or x = -10^(1/4)
x in { 10^(1/4), -10^(1/4) }
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