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r in (-oo:+oo)
150456.24 = 3.14*(4/3)*r^3 // - 3.14*(4/3)*r^3
150456.24-(3.14*(4/3)*r^3) = 0
150456.24-4.18666667*r^3 = 0
-4.18666667*r^3 = -150456.24 // : -4.18666667
r^3 = 35936.99997139
r^3 = 35936.99997139 // ^ 1/3
r = 35936.99997139^(1/3)
r = 35936.99997139^(1/3)
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