9l-21=3l+15

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Solution for 9l-21=3l+15 equation: 



9l-21=3l+15

We move all terms to the left:

9l-21-(3l+15)=0

We get rid of parentheses

9l-3l-15-21=0

We add all the numbers together, and all the variables

6l-36=0

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

6l=36

l=36/6

l=6

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