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(2l+10)=30
We move all terms to the left:
(2l+10)-(30)=0
We get rid of parentheses
2l+10-30=0
We add all the numbers together, and all the variables
2l-20=0
We move all terms containing l to the left, all other terms to the right
2l=20
l=20/2
l=10
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