1=x+21

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Solution for 1=x+21 equation: 



1=x+21

We move all terms to the left:

1-(x+21)=0

We get rid of parentheses

-x-21+1=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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