How were the original Ancient Greek Olympics different than our present-day Olympics?

In the Ancient Greek Olympics there were only ten sports while in modern day Olympics there are substantially more. Still, as in the modern games, they slowly added more. In the ancient games they had 4 running races, equestrian racing, wrestling, boxing, pancratium, pentathlon, and chariot races.

Explanation:

8 - (2a + 7) = a + 40     distribute/multiply - into (2a + 7)

8 - 2a - 7 = a + 40

1 - 2a = a + 40       add 2a on both sides

1 = 3a + 40         subtract 40 on both sides

-39 = 3a       divide 3 on both sides

-13 = a

[proof]

8 - (2a + 7) = a + 40

8 - (2(-13) + 7) = -13 + 40

8 - (-26 + 7) = 27

8 - (-19) = 27

8 + 19 = 27

27 = 27