9a-5a=12+13a

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Solution for 9a-5a=12+13a equation: 



9a-5a=12+13a

We move all terms to the left:

9a-5a-(12+13a)=0

We add all the numbers together, and all the variables

9a-5a-(13a+12)=0

We add all the numbers together, and all the variables

4a-(13a+12)=0

We get rid of parentheses

4a-13a-12=0

We add all the numbers together, and all the variables

-9a-12=0

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

-9a=12

a=12/-9

a=-1+1/3

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