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Thanks for help and for fixed first part! I fixed next errors the same way u did first and it's compiled. I'm still not sure what are these added marks doing, but that doesn't matter right now. Now I must fix some things up and send it to my teacher, I can learn what is exactly going on later :P ...

Hey,
I'm new to LaTeX. I have to write text which should look the same as text on paper that teacher gave us, but I have compile error.
https://www.writelatex.com/read/yjfqmbtsgczm
It says 'missing { inserted" but IMO everything is OK. I really don't know what to do so would be nice if I got help ...