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12l+(1-7l)=31
We move all terms to the left:
12l+(1-7l)-(31)=0
We add all the numbers together, and all the variables
12l+(-7l+1)-31=0
We get rid of parentheses
12l-7l+1-31=0
We add all the numbers together, and all the variables
5l-30=0
We move all terms containing l to the left, all other terms to the right
5l=30
l=30/5
l=6
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