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6x+9-x=3x+9+3
We move all terms to the left:
6x+9-x-(3x+9+3)=0
We add all the numbers together, and all the variables
6x-x-(3x+12)+9=0
We add all the numbers together, and all the variables
5x-(3x+12)+9=0
We get rid of parentheses
5x-3x-12+9=0
We add all the numbers together, and all the variables
2x-3=0
We move all terms containing x to the left, all other terms to the right
2x=3
x=3/2
x=1+1/2
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