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11x-20=x+9
We move all terms to the left:
11x-20-(x+9)=0
We get rid of parentheses
11x-x-9-20=0
We add all the numbers together, and all the variables
10x-29=0
We move all terms containing x to the left, all other terms to the right
10x=29
x=29/10
x=2+9/10
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