Please help.

5. Laplace(u, 3) random variable is also called Double Exponential(/, B) ran- dom variable, see Page 623 of the textbook. Use the moment generating function method to show that if X ~ Laplace(M = 0, B), then X and (Y1 - Y2) are iden- tically distributed, where Yi ~ Exponential(), i = 1, 2, and are independent