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