-13=5+a

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Solution for -13=5+a equation: 



-13=5+a

We move all terms to the left:

-13-(5+a)=0

We add all the numbers together, and all the variables

-(a+5)-13=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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