13=-8-7x

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Solution for 13=-8-7x equation: 



13=-8-7x

We move all terms to the left:

13-(-8-7x)=0

We add all the numbers together, and all the variables

-(-7x-8)+13=0

We get rid of parentheses

7x+8+13=0

We add all the numbers together, and all the variables

7x+21=0

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

7x=-21

x=-21/7

x=-3

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