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9+9x=9-9x
We move all terms to the left:
9+9x-(9-9x)=0
We add all the numbers together, and all the variables
9x-(-9x+9)+9=0
We get rid of parentheses
9x+9x-9+9=0
We add all the numbers together, and all the variables
18x=0
x=0/18
x=0
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