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2(2l+3)=42
We move all terms to the left:
2(2l+3)-(42)=0
We multiply parentheses
4l+6-42=0
We add all the numbers together, and all the variables
4l-36=0
We move all terms containing l to the left, all other terms to the right
4l=36
l=36/4
l=9
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