-20+-x=-40

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Solution for -20+-x=-40 equation: 



-20+-x=-40

We move all terms to the left:

-20+-x-(-40)=0

We add all the numbers together, and all the variables

-1x+20=0

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

-x=-20

x=-20/-1

x=+20

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