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11x+21=9x+23
We move all terms to the left:
11x+21-(9x+23)=0
We get rid of parentheses
11x-9x-23+21=0
We add all the numbers together, and all the variables
2x-2=0
We move all terms containing x to the left, all other terms to the right
2x=2
x=2/2
x=1
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