3a+6-a=12

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Solution for 3a+6-a=12 equation: 



3a+6-a=12

We move all terms to the left:

3a+6-a-(12)=0

We add all the numbers together, and all the variables

2a-6=0

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

2a=6

a=6/2

a=3

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