Final answer:
The successful album released by Run DMC in 1986 was 'Raising Hell', and it sold approximately 3 million copies, establishing itself as a massive commercial success.
Step-by-step explanation:
The successful album released by Run DMC in 1986 is 'Raising Hell'. This album marked a breakthrough for the group and for hip hop music, as it was the first rap album to receive widespread commercial success. 'Raising Hell' featured hits like 'Walk This Way' with Aerosmith, 'My Adidas', and 'It's Tricky'. Regarding the number of copies were sold, 'Raising Hell' sold approximately 3 million copies in the United States, making it one of the best-selling rap albums of the 1980s.