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4x+3=x+2x+9
We move all terms to the left:
4x+3-(x+2x+9)=0
We add all the numbers together, and all the variables
4x-(3x+9)+3=0
We get rid of parentheses
4x-3x-9+3=0
We add all the numbers together, and all the variables
x-6=0
We move all terms containing x to the left, all other terms to the right
x=6
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