9=13+4a

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Solution for 9=13+4a equation: 



9=13+4a

We move all terms to the left:

9-(13+4a)=0

We add all the numbers together, and all the variables

-(4a+13)+9=0

We get rid of parentheses

-4a-13+9=0

We add all the numbers together, and all the variables

-4a-4=0

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

-4a=4

a=4/-4

a=-1

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