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L in (-oo:+oo)
(1350*L^3)/4 = 50 // - 50
(1350*L^3)/4-50 = 0
675/2*L^3 = 50 // : 675/2
L^3 = 4/27
L^3 = 4/27 // ^ 1/3
L = (4/27)^(1/3)
L = (4/27)^(1/3)
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