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x-9=x-3-6
We move all terms to the left:
x-9-(x-3-6)=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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