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r in (-oo:+oo)
1000 = (r^3)/2 // - (r^3)/2
1000-((r^3)/2) = 0
-1/2*r^3 = -1000 // : -1/2
r^3 = 2000
r^3 = 2000 // ^ 1/3
r = 10*2^(1/3)
r = 10*2^(1/3)
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