13=a/3-9

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Solution for 13=a/3-9 equation: 



13=a/3-9

We move all terms to the left:

13-(a/3-9)=0

We get rid of parentheses

-a/3+9+13=0

We multiply all the terms by the denominator


-a+9*3+13*3=0

We add all the numbers together, and all the variables

-1a+66=0

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

-a=-66

a=-66/-1

a=+66

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