In reference to the attached image: This math exam includes two equations which I am guessing qualify as "ununifed systems of equations" according to An Instruction to Braille Mathematics, page 317, although I cannot locate this in the actual Nemeth Code book. And although the printed text in the above mentioned resource previously stated that this is NOT spatial material, I have penciled notes in my book that the rule was changed so it is spatial with blank lines above and below. So I set this as a displayed spatial, and I put the comma on the top line. Following the comma, a conditional expression, which I needed to runover. Please let me know if I've transcribed this correctly or need to do it another way. Thanks!
The attached image shows the format that I would suggest. It treats the system of equations not as displayed material but as a continuation of the text, as it appears to be formatted in print.
The attached image whose file name begins with a 2 shows a pooossssible alternative, which treats the system of equations as displayed material, with the remark printed to the right of a system of equations that doesn't have an enlarged right grouping symbol brailled on a line separate from the system.
Thank you for your question! You're tackling a sticky issue, with quite accurate dots!