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2l+2(l+10)=100
We move all terms to the left:
2l+2(l+10)-(100)=0
We multiply parentheses
2l+2l+20-100=0
We add all the numbers together, and all the variables
4l-80=0
We move all terms containing l to the left, all other terms to the right
4l=80
l=80/4
l=20
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