a-5=2a-21

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Solution for a-5=2a-21 equation: 



a-5=2a-21

We move all terms to the left:

a-5-(2a-21)=0

We get rid of parentheses

a-2a+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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