Answer: Some canonical examples of the common good in a modern liberal democracy include: the road system; public parks; police protection and public safety; courts and the judicial system; public schools; museums and cultural institutions; public transportation; civil liberties, such as the freedom of speech, etc.
Explanation: I hope this works... I don't really understand what the question means or what it's talking about specifically... but if it's about modern liberal democracy, this is what I know. Sorry if it doesn't work. :(
You did right by subtracting 12 on both sides but after you subtracted you should have got -192 then you would divide 9 on both sides and once you have found what x equals to substitute what you have for x in your original equation
