12+5a=9

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Solution for 12+5a=9 equation: 



12+5a=9

We move all terms to the left:

12+5a-(9)=0

We add all the numbers together, and all the variables

5a+3=0

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

5a=-3

a=-3/5

a=-3/5

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