Please simplify the following Expressions:

- 52 (X - Y) + 52 (Y - X)
- 12 (U - V) + 6 (S - T) - 8 (V - U) - 14 (T - S)
- 6 a (b -c) + 9 b (a - c)

"Outsmarting the Competition" - The Washington Post, 2001. (Hundreds of students accepted to TJ since 1994)

TJ test prep practice problems for our students and readers. The problems provide a very small sampling of what Optimal TJ Prep students work with.

Please simplify the following Expressions:

- 52 (X - Y) + 52 (Y - X)
- 12 (U - V) + 6 (S - T) - 8 (V - U) - 14 (T - S)
- 6 a (b -c) + 9 b (a - c)