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r in (-oo:+oo)
144 = (4/3)*r^3 // - (4/3)*r^3
144-((4/3)*r^3) = 0
(-4/3)*r^3+144 = 0
-4/3*r^3 = -144 // : -4/3
r^3 = 108
r^3 = 108 // ^ 1/3
r = 3*4^(1/3)
r = 3*4^(1/3)
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