L-20=7l-l

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Solution for L-20=7l-l equation: 



-20=7L-L

We move all terms to the left:

-20-(7L-L)=0

We add all the numbers together, and all the variables

-(+6L)-20=0

We get rid of parentheses

-6L-20=0

We move all terms containing L to the left, all other terms to the right

-6L=20

L=20/-6

L=-3+1/3

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