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