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n in (-oo:+oo)
3.14*6*(1/3)*n^2 = 100.48 // - 100.48
3.14*6*(1/3)*n^2-100.48 = 0
6.2799999372*n^2 = 100.48 // : 6.2799999372
n^2 = 16.00000016
n^2 = 16.00000016 // ^ 1/2
abs(n) = 16.00000016^(1/2)
n = 16.00000016^(1/2) or n = -16.00000016^(1/2)
n in { 16.00000016^(1/2), -16.00000016^(1/2) }
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