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