L+21=l+87

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Solution for L+21=l+87 equation: 



+21=L+87

We move all terms to the left:

+21-(L+87)=0

We get rid of parentheses

-L-87+21=0

We add all the numbers together, and all the variables

-1L-66=0

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

-L=66

L=66/-1

L=-66

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