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+16=0

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

-a=-16

a=-16/-1

a=+16

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