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x+9=2x-111
We move all terms to the left:
x+9-(2x-111)=0
We get rid of parentheses
x-2x+111+9=0
We add all the numbers together, and all the variables
-1x+120=0
We move all terms containing x to the left, all other terms to the right
-x=-120
x=-120/-1
x=+120
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