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-9+11x=9+9x
We move all terms to the left:
-9+11x-(9+9x)=0
We add all the numbers together, and all the variables
11x-(9x+9)-9=0
We get rid of parentheses
11x-9x-9-9=0
We add all the numbers together, and all the variables
2x-18=0
We move all terms containing x to the left, all other terms to the right
2x=18
x=18/2
x=9
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