21=a-5

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Solution for 21=a-5 equation: 



21=a-5

We move all terms to the left:

21-(a-5)=0

We get rid of parentheses

-a+5+21=0

We add all the numbers together, and all the variables

-1a+26=0

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

-a=-26

a=-26/-1

a=+26

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