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-19=4a-12
We move all terms to the left:
-19-(4a-12)=0
We get rid of parentheses
-4a+12-19=0
We add all the numbers together, and all the variables
-4a-7=0
We move all terms containing a to the left, all other terms to the right
-4a=7
a=7/-4
a=-1+3/4
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