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(2x-1)-(x+1)=3
We move all terms to the left:
(2x-1)-(x+1)-(3)=0
We get rid of parentheses
2x-x-1-1-3=0
We add all the numbers together, and all the variables
x-5=0
We move all terms containing x to the left, all other terms to the right
x=5
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