28=x+21

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Solution for 28=x+21 equation: 



28=x+21

We move all terms to the left:

28-(x+21)=0

We get rid of parentheses

-x-21+28=0

We add all the numbers together, and all the variables

-1x+7=0

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

-x=-7

x=-7/-1

x=+7

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