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(27*x^3)/4 = 125 // - 125
(27*x^3)/4-125 = 0
27/4*x^3 = 125 // : 27/4
x^3 = 500/27
x^3 = 500/27 // ^ 1/3
x = (500/27)^(1/3)
x = (500/27)^(1/3)
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