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2(l)+2(l-12)=156
We move all terms to the left:
2(l)+2(l-12)-(156)=0
We multiply parentheses
2l+2l-24-156=0
We add all the numbers together, and all the variables
4l-180=0
We move all terms containing l to the left, all other terms to the right
4l=180
l=180/4
l=45
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