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2(2l+4)=28
We move all terms to the left:
2(2l+4)-(28)=0
We multiply parentheses
4l+8-28=0
We add all the numbers together, and all the variables
4l-20=0
We move all terms containing l to the left, all other terms to the right
4l=20
l=20/4
l=5
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