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 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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