12a+9a-6a=13

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Solution for 12a+9a-6a=13 equation: 



12a+9a-6a=13

We move all terms to the left:

12a+9a-6a-(13)=0

We add all the numbers together, and all the variables

15a-13=0

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

15a=13

a=13/15

a=13/15

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