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7=2l+12
We move all terms to the left:
7-(2l+12)=0
We get rid of parentheses
-2l-12+7=0
We add all the numbers together, and all the variables
-2l-5=0
We move all terms containing l to the left, all other terms to the right
-2l=5
l=5/-2
l=-2+1/2
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