13a-31=2a-9

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Solution for 13a-31=2a-9 equation: 



13a-31=2a-9

We move all terms to the left:

13a-31-(2a-9)=0

We get rid of parentheses

13a-2a+9-31=0

We add all the numbers together, and all the variables

11a-22=0

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

11a=22

a=22/11

a=2

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