-16=a+21

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Solution for -16=a+21 equation: 



-16=a+21

We move all terms to the left:

-16-(a+21)=0

We get rid of parentheses

-a-21-16=0

We add all the numbers together, and all the variables

-1a-37=0

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

-a=37

a=37/-1

a=-37

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