21=112-l

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Solution for 21=112-l equation: 



21=112-l

We move all terms to the left:

21-(112-l)=0

We add all the numbers together, and all the variables

-(-1l+112)+21=0

We get rid of parentheses

1l-112+21=0

We add all the numbers together, and all the variables

l-91=0

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

l=91

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