Im new to programming, im learning ruby.

Here is the guide I am working through:
http://pine.fm/LearnToProgram/?Chapter=01

At the bottom of the page there are these sample calculations:
puts 5 * (12-8) + -15 (is that + minus15 or does the + and the - mean
something combined? same for the one below with * and -52)
puts 98 + (59872 / (13*8)) * -52

What do they do? What are the brackets for?
I sort of remember doing something simular to this when I was using
excel in a course i did. Is the number is the brackets calculated first?
Can someone explain this to me? Or give me a link were I can find more
information.

Extreamly confused newbie! Please help!

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