12=-21+3x

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Solution for 12=-21+3x equation: 



12=-21+3x

We move all terms to the left:

12-(-21+3x)=0

We add all the numbers together, and all the variables

-(3x-21)+12=0

We get rid of parentheses

-3x+21+12=0

We add all the numbers together, and all the variables

-3x+33=0

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

-3x=-33

x=-33/-3

x=+11

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