8=-x-x

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Solution for 8=-x-x equation: 



8=-x-x

We move all terms to the left:

8-(-x-x)=0

We add all the numbers together, and all the variables

-(-2x)+8=0

We get rid of parentheses

2x+8=0

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

2x=-8

x=-8/2

x=-4

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