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l(l-2)(l-3)=30
We move all terms to the left:
l(l-2)(l-3)-(30)=0
We multiply parentheses ..
l(+l^2-3l-2l+6)-30=0
We multiply parentheses
l^3-3l^2-2l^2+6l-30=0
We do not support elpression: l^3
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