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2.8 = (x/5)^3 // - (x/5)^3
2.8-(x/5)^3 = 0
-1*x^3 = -2.8 // : -1
x^3 = 2.8
x^3 = 2.8 // ^ 1/3
x = 2.8^(1/3)
x = 2.8^(1/3)
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