12+3a=9-8a

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Solution for 12+3a=9-8a equation: 



12+3a=9-8a

We move all terms to the left:

12+3a-(9-8a)=0

We add all the numbers together, and all the variables

3a-(-8a+9)+12=0

We get rid of parentheses

3a+8a-9+12=0

We add all the numbers together, and all the variables

11a+3=0

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

11a=-3

a=-3/11

a=-3/11

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