Answer:
Raul is 15 years old.
Explanation:
The number of years from the start of the Great Depression to Nixon's election is six years less than three times Raul's age: 3r-6
If then Nixon's first election happened 39 years after the Great Depression, then: 3r-6=39
3r-6=39 Add six to both sides so the 6 on the left side gets canceled out (positive and negative cancel each other out) so the equation will now look like this: 3r=45
Then divide 3 on both sides (multiplication and division also cancel each other out), then the equation looks like this: r=15
And so, Raul is 15 years old.