13=-a-4

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Solution for 13=-a-4 equation: 



13=-a-4

We move all terms to the left:

13-(-a-4)=0

We add all the numbers together, and all the variables

-(-1a-4)+13=0

We get rid of parentheses

1a+4+13=0

We add all the numbers together, and all the variables

a+17=0

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

a=-17

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