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12=x+6+2x
We move all terms to the left:
12-(x+6+2x)=0
We add all the numbers together, and all the variables
-(3x+6)+12=0
We get rid of parentheses
-3x-6+12=0
We add all the numbers together, and all the variables
-3x+6=0
We move all terms containing x to the left, all other terms to the right
-3x=-6
x=-6/-3
x=+2
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