-20=l+3l

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Solution for -20=l+3l equation: 



-20=l+3l

We move all terms to the left:

-20-(l+3l)=0

We add all the numbers together, and all the variables

-(+4l)-20=0

We get rid of parentheses

-4l-20=0

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

-4l=20

l=20/-4

l=-5

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