15=a-9

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Solution for 15=a-9 equation: 



15=a-9

We move all terms to the left:

15-(a-9)=0

We get rid of parentheses

-a+9+15=0

We add all the numbers together, and all the variables

-1a+24=0

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

-a=-24

a=-24/-1

a=+24

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