21=7-a

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Solution for 21=7-a equation: 



21=7-a

We move all terms to the left:

21-(7-a)=0

We add all the numbers together, and all the variables

-(-1a+7)+21=0

We get rid of parentheses

1a-7+21=0

We add all the numbers together, and all the variables

a+14=0

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

a=-14

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