3a-9=a+7

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Solution for 3a-9=a+7 equation: 



3a-9=a+7

We move all terms to the left:

3a-9-(a+7)=0

We get rid of parentheses

3a-a-7-9=0

We add all the numbers together, and all the variables

2a-16=0

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

2a=16

a=16/2

a=8

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