A signal starts at point x as it travels to point y it loses 8 db at point y the signal is boosted by 10bb as the signal travels to point z it loses 7 db what is the db strength of the signal at point?

A signal starts at point X. As it travels to point Y, it loses 10db. At point Y, the signal

is boosted by 5db. As the signal travels to point Z, it loses 7db. What is the db

strength of the signal at point Z?