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12a-19=8a+5
We move all terms to the left:
12a-19-(8a+5)=0
We get rid of parentheses
12a-8a-5-19=0
We add all the numbers together, and all the variables
4a-24=0
We move all terms containing a to the left, all other terms to the right
4a=24
a=24/4
a=6
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