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19=2a-1
We move all terms to the left:
19-(2a-1)=0
We get rid of parentheses
-2a+1+19=0
We add all the numbers together, and all the variables
-2a+20=0
We move all terms containing a to the left, all other terms to the right
-2a=-20
a=-20/-2
a=+10
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