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3x+9+4x+x=3x+9+4x+x=x+x+
We move all terms to the left:
3x+9+4x+x-(3x+9+4x+x)=0
We add all the numbers together, and all the variables
3x+4x+x-(8x+9)+9=0
We add all the numbers together, and all the variables
8x-(8x+9)+9=0
We get rid of parentheses
8x-8x-9+9=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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