0=21-l

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Solution for 0=21-l equation: 



0=21-l

We move all terms to the left:

0-(21-l)=0

We add all the numbers together, and all the variables

-(-1l+21)+0=0

We add all the numbers together, and all the variables

-(-1l+21)=0

We get rid of parentheses

1l-21=0

We add all the numbers together, and all the variables

l-21=0

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

l=21

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