12=3x+21

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Solution for 12=3x+21 equation: 



12=3x+21

We move all terms to the left:

12-(3x+21)=0

We get rid of parentheses

-3x-21+12=0

We add all the numbers together, and all the variables

-3x-9=0

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

-3x=9

x=9/-3

x=-3

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