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((8/3)*x^3)/8 = 40*(3/8) // - 40*(3/8)
((8/3)*x^3)/8-(40*(3/8)) = 0
((8/3)*x^3)/8-15 = 0
1/3*x^3 = 15 // : 1/3
x^3 = 45
x^3 = 45 // ^ 1/3
x = 45^(1/3)
x = 45^(1/3)
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