15=a-21

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Solution for 15=a-21 equation: 



15=a-21

We move all terms to the left:

15-(a-21)=0

We get rid of parentheses

-a+21+15=0

We add all the numbers together, and all the variables

-1a+36=0

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

-a=-36

a=-36/-1

a=+36

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