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x*((3*6*x*x)/5) = 100 // - 100
x*((3*6*x*x)/5)-100 = 0
18/5*x^3 = 100 // : 18/5
x^3 = 250/9
x^3 = 250/9 // ^ 1/3
x = (250/9)^(1/3)
x = (250/9)^(1/3)
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