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L in (-oo:+oo)
0.8 = (L^3)/4 // - (L^3)/4
0.8-((L^3)/4) = 0
-1/4*L^3 = -0.8 // : -1/4
L^3 = 3.2
L^3 = 3.2 // ^ 1/3
L = 3.2^(1/3)
L = 3.2^(1/3)
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