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11L-21=8L+15
We move all terms to the left:
11L-21-(8L+15)=0
We get rid of parentheses
11L-8L-15-21=0
We add all the numbers together, and all the variables
3L-36=0
We move all terms containing L to the left, all other terms to the right
3L=36
L=36/3
L=12
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