30=x+21

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Solution for 30=x+21 equation: 



30=x+21

We move all terms to the left:

30-(x+21)=0

We get rid of parentheses

-x-21+30=0

We add all the numbers together, and all the variables

-1x+9=0

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

-x=-9

x=-9/-1

x=+9

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