12a-5=13a-9

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



12a-5=13a-9

We move all terms to the left:

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

We get rid of parentheses

12a-13a+9-5=0

We add all the numbers together, and all the variables

-1a+4=0

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

-a=-4

a=-4/-1

a=+4

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