-20=-x-x

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Solution for -20=-x-x equation: 



-20=-x-x

We move all terms to the left:

-20-(-x-x)=0

We add all the numbers together, and all the variables

-(-2x)-20=0

We get rid of parentheses

2x-20=0

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

2x=20

x=20/2

x=10

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