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2-((3/8)*x^13) = 0
(-3/8)*x^13+2 = 0
-3/8*x^13 = -2 // : -3/8
x^13 = 16/3
x^13 = 16/3 // ^ 1/13
x = (16/3)^(1/13)
x = (16/3)^(1/13)
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