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12=1x+2x

We move all terms to the left:

12-(1x+2x)=0

We add all the numbers together, and all the variables

-(+3x)+12=0

We get rid of parentheses

-3x+12=0

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

-3x=-12

x=-12/-3

x=+4

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