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64=2l+2(20)
We move all terms to the left:
64-(2l+2(20))=0
We get rid of parentheses
-2l-220+64=0
We add all the numbers together, and all the variables
-2l-156=0
We move all terms containing l to the left, all other terms to the right
-2l=156
l=156/-2
l=-78
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