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