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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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