13=-2a+a

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Solution for 13=-2a+a equation: 



13=-2a+a

We move all terms to the left:

13-(-2a+a)=0

We add all the numbers together, and all the variables

-(-1a)+13=0

We get rid of parentheses

1a+13=0

We add all the numbers together, and all the variables

a+13=0

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

a=-13

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