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How to adjust brightness on Fedora 25?

I have tried various sorts of methods to adjust the brightness: installing xbacklight, xrandr... Also I am new to linux so I would appreciate a slightly dumbed down answer. I have a DELL Inspiron 7559. The /sys/class/backlight/ folder seems to be empty, even after clicking 'Show Hidden Files'. I have nvidia geforce 960m and intel hd graphics 530. I have been looking around a lot of forums in vain and it's driving me crazy! I would really appreciate your help. Thank you.