7=-13-x

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Solution for 7=-13-x equation: 



7=-13-x

We move all terms to the left:

7-(-13-x)=0

We add all the numbers together, and all the variables

-(-1x-13)+7=0

We get rid of parentheses

1x+13+7=0

We add all the numbers together, and all the variables

x+20=0

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

x=-20

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