9=2a+31

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Solution for 9=2a+31 equation: 



9=2a+31

We move all terms to the left:

9-(2a+31)=0

We get rid of parentheses

-2a-31+9=0

We add all the numbers together, and all the variables

-2a-22=0

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

-2a=22

a=22/-2

a=-11

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