x+12=2x+21

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Solution for x+12=2x+21 equation: 



x+12=2x+21

We move all terms to the left:

x+12-(2x+21)=0

We get rid of parentheses

x-2x-21+12=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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