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