3a-15=a+9

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Solution for 3a-15=a+9 equation: 



3a-15=a+9

We move all terms to the left:

3a-15-(a+9)=0

We get rid of parentheses

3a-a-9-15=0

We add all the numbers together, and all the variables

2a-24=0

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

2a=24

a=24/2

a=12

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