13=-26+a

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Solution for 13=-26+a equation: 



13=-26+a

We move all terms to the left:

13-(-26+a)=0

We add all the numbers together, and all the variables

-(a-26)+13=0

We get rid of parentheses

-a+26+13=0

We add all the numbers together, and all the variables

-1a+39=0

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

-a=-39

a=-39/-1

a=+39

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