Mr. rifkin had 240 digital and manual cameras. after donating 82 digital cameras and 26 manual cameras, he had three times as many digital cameras as manual cameras left. how many digital cameras did he have to begin with?

After the donation,
3m + m = 132
manual = 33
digital = 99

Before the donation, he had 82 more digital and 26 more manual cameras.
82 + 99 = 181 digital
26 + 33 = 59 manual
For a double check, before donation,
digital + manual = 240
181 + 59 = 240
So, to begin with, the number of digital cameras = 181.