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((2/3)*x^57)/9+(5/6)^3 = 0
2/27*x^57 = -125/216 // : 2/27
x^57 = -125/16
x^57 = -125/16 // ^ 1/57
x = -(125/16)^(1/57)
x = -(125/16)^(1/57)
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