(x-7)=21

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Solution for (x-7)=21 equation: 



(x-7)=21

We move all terms to the left:

(x-7)-(21)=0

We get rid of parentheses

x-7-21=0

We add all the numbers together, and all the variables

x-28=0

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

x=28

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