x+21=2x+21

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Solution for x+21=2x+21 equation: 



x+21=2x+21

We move all terms to the left:

x+21-(2x+21)=0

We get rid of parentheses

x-2x-21+21=0

We add all the numbers together, and all the variables

-x=0

x=0/-1

x=0

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