x=2x+-21

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Solution for x=2x+-21 equation: 



x=2x+-21

We move all terms to the left:

x-(2x+-21)=0

We add all the numbers together, and all the variables

x-(2x-21)=0

We get rid of parentheses

x-2x+21=0

We add all the numbers together, and all the variables

-1x+21=0

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

-x=-21

x=-21/-1

x=+21

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