-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-8=0

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

-a=8

a=8/-1

a=-8

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