A-5=a-21

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Solution for A-5=a-21 equation: 



-5=A-21

We move all terms to the left:

-5-(A-21)=0

We get rid of parentheses

-A+21-5=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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