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11x-21=x-9
We move all terms to the left:
11x-21-(x-9)=0
We get rid of parentheses
11x-x+9-21=0
We add all the numbers together, and all the variables
10x-12=0
We move all terms containing x to the left, all other terms to the right
10x=12
x=12/10
x=1+1/5
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