a computer repairman charges an initial fee of $100 plus an hourly fee of $75. Mr. Billings paid the repairman $475. How many hours did the repairman work?

475 - 100 = 75x
Subtract 100 from the 475
375 = 75x
Divide both side w 75 . The 75 on the X side cancels out
375/ 75 = 5
X= 5