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r in (-oo:+oo)
22437.9167 = 3.14*(4/3)*r^3 // - 3.14*(4/3)*r^3
22437.9167-(3.14*(4/3)*r^3) = 0
22437.9167-4.18666667*r^3 = 0
-4.18666667*r^3 = -22437.9167 // : -4.18666667
r^3 = 5359.37500369
r^3 = 5359.37500369 // ^ 1/3
r = 5359.37500369^(1/3)
r = 5359.37500369^(1/3)
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