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