13=-8-x

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Solution for 13=-8-x equation: 



13=-8-x

We move all terms to the left:

13-(-8-x)=0

We add all the numbers together, and all the variables

-(-1x-8)+13=0

We get rid of parentheses

1x+8+13=0

We add all the numbers together, and all the variables

x+21=0

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

x=-21

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