<em><u>You need to solve for Z so we need to get z by itself so take 17 and add it to both sides because whatever is on the left side of the equal sign is always what you need to add 17+ 17 then 17+(-9) you get your answers then add those two up then you get z=60.</u></em>
<u><em>Thank you for asking this great question need any other help please let me know by commenting below I'd be glad to help. </em></u>
<u><em>I'd also greatly appreciate you if you mark me as brainliest and click that thanks button.( optional )</em></u>