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12x+6=9x+12.
We move all terms to the left:
12x+6-(9x+12.)=0
We add all the numbers together, and all the variables
12x-(9x+12)+6=0
We get rid of parentheses
12x-9x-12+6=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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