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12x-4=9x-2
We move all terms to the left:
12x-4-(9x-2)=0
We get rid of parentheses
12x-9x+2-4=0
We add all the numbers together, and all the variables
3x-2=0
We move all terms containing x to the left, all other terms to the right
3x=2
x=2/3
x=2/3
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