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-3x+9+4x=3+x+6
We move all terms to the left:
-3x+9+4x-(3+x+6)=0
We add all the numbers together, and all the variables
-3x+4x-(x+9)+9=0
We add all the numbers together, and all the variables
x-(x+9)+9=0
We get rid of parentheses
x-x-9+9=0
We add all the numbers together, and all the variables
=0
x=0/1
x=0
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