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(4/3)*(22/7)*x^3 = 108 // - 108
(4/3)*(22/7)*x^3-108 = 0
88/21*x^3 = 108 // : 88/21
x^3 = 567/22
x^3 = 567/22 // ^ 1/3
x = (567/22)^(1/3)
x = (567/22)^(1/3)
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