3a-12=a+9

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Solution for 3a-12=a+9 equation: 



3a-12=a+9

We move all terms to the left:

3a-12-(a+9)=0

We get rid of parentheses

3a-a-9-12=0

We add all the numbers together, and all the variables

2a-21=0

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

2a=21

a=21/2

a=10+1/2

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