2x+12=321-x

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Solution for 2x+12=321-x equation: 



2x+12=321-x

We move all terms to the left:

2x+12-(321-x)=0

We add all the numbers together, and all the variables

2x-(-1x+321)+12=0

We get rid of parentheses

2x+1x-321+12=0

We add all the numbers together, and all the variables

3x-309=0

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

3x=309

x=309/3

x=103

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