12a-15=6a-9

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Solution for 12a-15=6a-9 equation: 



12a-15=6a-9

We move all terms to the left:

12a-15-(6a-9)=0

We get rid of parentheses

12a-6a+9-15=0

We add all the numbers together, and all the variables

6a-6=0

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

6a=6

a=6/6

a=1

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