-a+13=31

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Solution for -a+13=31 equation: 



-a+13=31

We move all terms to the left:

-a+13-(31)=0

We add all the numbers together, and all the variables

-1a-18=0

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

-a=18

a=18/-1

a=-18

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