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-4a-12=68-12a
We move all terms to the left:
-4a-12-(68-12a)=0
We add all the numbers together, and all the variables
-4a-(-12a+68)-12=0
We get rid of parentheses
-4a+12a-68-12=0
We add all the numbers together, and all the variables
8a-80=0
We move all terms containing a to the left, all other terms to the right
8a=80
a=80/8
a=10
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