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