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(-3)^2-((32/8)*x^7) = 0
(-3)^2-4*x^7 = 0
-4*x^7 = -9 // : -4
x^7 = 9/4
x^7 = 9/4 // ^ 1/7
x = (9/4)^(1/7)
x = (9/4)^(1/7)
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