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(l-2)/2=1
We move all terms to the left:
(l-2)/2-(1)=0
We multiply all the terms by the denominator
(l-2)-1*2=0
We add all the numbers together, and all the variables
(l-2)-2=0
We get rid of parentheses
l-2-2=0
We add all the numbers together, and all the variables
l-4=0
We move all terms containing l to the left, all other terms to the right
l=4
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