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400-((32*x^5)/9) = 0
(-32/9)*x^5+400 = 0
-32/9*x^5 = -400 // : -32/9
x^5 = 225/2
x^5 = 225/2 // ^ 1/5
x = (225/2)^(1/5)
x = (225/2)^(1/5)
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