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X-9=23+9X
We move all terms to the left:
X-9-(23+9X)=0
We add all the numbers together, and all the variables
X-(9X+23)-9=0
We get rid of parentheses
X-9X-23-9=0
We add all the numbers together, and all the variables
-8X-32=0
We move all terms containing X to the left, all other terms to the right
-8X=32
X=32/-8
X=-4
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