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3x+(-x)=9+x-x
We move all terms to the left:
3x+(-x)-(9+x-x)=0
We add all the numbers together, and all the variables
3x+(-1x)-9=0
We get rid of parentheses
3x-1x-9=0
We add all the numbers together, and all the variables
2x-9=0
We move all terms containing x to the left, all other terms to the right
2x=9
x=9/2
x=4+1/2
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