21=x-8

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Solution for 21=x-8 equation: 



21=x-8

We move all terms to the left:

21-(x-8)=0

We get rid of parentheses

-x+8+21=0

We add all the numbers together, and all the variables

-1x+29=0

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

-x=-29

x=-29/-1

x=+29

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