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220=2l+2(45)
We move all terms to the left:
220-(2l+2(45))=0
We get rid of parentheses
-2l-245+220=0
We add all the numbers together, and all the variables
-2l-25=0
We move all terms containing l to the left, all other terms to the right
-2l=25
l=25/-2
l=-12+1/2
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