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r in (-oo:+oo)
267.9467 = 314*(4/3)*r^3 // - 314*(4/3)*r^3
267.9467-(314*(4/3)*r^3) = 0
(-1256/3)*r^3+267.9467 = 0
-1256/3*r^3 = -267.9467 // : -1256/3
r^3 = 0.64000008
r^3 = 0.64000008 // ^ 1/3
r = 0.64000008^(1/3)
r = 0.64000008^(1/3)
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