2a-8a=12-9

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Solution for 2a-8a=12-9 equation: 



2a-8a=12-9

We move all terms to the left:

2a-8a-(12-9)=0

We add all the numbers together, and all the variables

2a-8a-3=0

We add all the numbers together, and all the variables

-6a-3=0

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

-6a=3

a=3/-6

a=-1/2

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