x-20=2x+x

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



x-20=2x+x

We move all terms to the left:

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

We add all the numbers together, and all the variables

x-(+3x)-20=0

We get rid of parentheses

x-3x-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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