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21x-1=18x+1
We move all terms to the left:
21x-1-(18x+1)=0
We get rid of parentheses
21x-18x-1-1=0
We add all the numbers together, and all the variables
3x-2=0
We move all terms containing x to the left, all other terms to the right
3x=2
x=2/3
x=2/3
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