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1x=3x+12
We move all terms to the left:
1x-(3x+12)=0
We add all the numbers together, and all the variables
x-(3x+12)=0
We get rid of parentheses
x-3x-12=0
We add all the numbers together, and all the variables
-2x-12=0
We move all terms containing x to the left, all other terms to the right
-2x=12
x=12/-2
x=-6
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