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19a-12-4a=57-
We move all terms to the left:
19a-12-4a-(57-)=0
We add all the numbers together, and all the variables
19a-4a-12-0=0
We add all the numbers together, and all the variables
15a-12=0
We move all terms containing a to the left, all other terms to the right
15a=12
a=12/15
a=4/5
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