12a-15=13a+9

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Solution for 12a-15=13a+9 equation: 



12a-15=13a+9

We move all terms to the left:

12a-15-(13a+9)=0

We get rid of parentheses

12a-13a-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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