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19=3a-
We move all terms to the left:
19-(3a-)=0
We add all the numbers together, and all the variables
-(+3a)+19=0
We get rid of parentheses
-3a+19=0
We move all terms containing a to the left, all other terms to the right
-3a=-19
a=-19/-3
a=6+1/3
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