13=a-5

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Solution for 13=a-5 equation: 



13=a-5

We move all terms to the left:

13-(a-5)=0

We get rid of parentheses

-a+5+13=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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