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=42+L
We move all terms to the left:
-(42+L)=0
We add all the numbers together, and all the variables
-(L+42)=0
We get rid of parentheses
-L-42=0
We add all the numbers together, and all the variables
-1L-42=0
We move all terms containing L to the left, all other terms to the right
-L=42
L=42/-1
L=-42
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