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2(a-1)+1=3
We move all terms to the left:
2(a-1)+1-(3)=0
We add all the numbers together, and all the variables
2(a-1)-2=0
We multiply parentheses
2a-2-2=0
We add all the numbers together, and all the variables
2a-4=0
We move all terms containing a to the left, all other terms to the right
2a=4
a=4/2
a=2
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