-x-x=20

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Solution for -x-x=20 equation: 



-x-x=20

We move all terms to the left:

-x-x-(20)=0

We add all the numbers together, and all the variables

-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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