x+20=2x-20=x-40

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Solution for x+20=2x-20=x-40 equation: 



x+20=2x-20=x-40

We move all terms to the left:

x+20-(2x-20)=0

We get rid of parentheses

x-2x+20+20=0

We add all the numbers together, and all the variables

-1x+40=0

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

-x=-40

x=-40/-1

x=+40

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