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80=2l+2(8)
We move all terms to the left:
80-(2l+2(8))=0
We get rid of parentheses
-2l-28+80=0
We add all the numbers together, and all the variables
-2l+52=0
We move all terms containing l to the left, all other terms to the right
-2l=-52
l=-52/-2
l=+26
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