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20+2x-29=x+9
We move all terms to the left:
20+2x-29-(x+9)=0
We add all the numbers together, and all the variables
2x-(x+9)-9=0
We get rid of parentheses
2x-x-9-9=0
We add all the numbers together, and all the variables
x-18=0
We move all terms containing x to the left, all other terms to the right
x=18
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