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2x+6x-(4x+9)=3x
We move all terms to the left:
2x+6x-(4x+9)-(3x)=0
We add all the numbers together, and all the variables
5x-(4x+9)=0
We get rid of parentheses
5x-4x-9=0
We add all the numbers together, and all the variables
x-9=0
We move all terms containing x to the left, all other terms to the right
x=9
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