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l/2+9=12
We move all terms to the left:
l/2+9-(12)=0
We add all the numbers together, and all the variables
l/2-3=0
We multiply all the terms by the denominator
l-3*2=0
We add all the numbers together, and all the variables
l-6=0
We move all terms containing l to the left, all other terms to the right
l=6
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