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60-((2/3)*x^12) = 0
(-2/3)*x^12+60 = 0
-2/3*x^12 = -60 // : -2/3
x^12 = 90
x^12 = 90 // ^ 1/12
abs(x) = 90^(1/12)
x = 90^(1/12) or x = -90^(1/12)
x in { 90^(1/12), -90^(1/12) }
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