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r in (-oo:+oo)
23216.0422 = 3.14*(4/3)*r^3 // - 3.14*(4/3)*r^3
23216.0422-(3.14*(4/3)*r^3) = 0
23216.0422-4.18666667*r^3 = 0
-4.18666667*r^3 = -23216.0422 // : -4.18666667
r^3 = 5545.23300514
r^3 = 5545.23300514 // ^ 1/3
r = 5545.23300514^(1/3)
r = 5545.23300514^(1/3)
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