21=13-a

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Solution for 21=13-a equation: 



21=13-a

We move all terms to the left:

21-(13-a)=0

We add all the numbers together, and all the variables

-(-1a+13)+21=0

We get rid of parentheses

1a-13+21=0

We add all the numbers together, and all the variables

a+8=0

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

a=-8

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