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91/4-(((3/8)*x^9)/12) = 0
(-1/32)*x^9+91/4 = 0
-1/32*x^9 = -91/4 // : -1/32
x^9 = 728
x^9 = 728 // ^ 1/9
x = 728^(1/9)
x = 728^(1/9)
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