Question

(15/8 + 2/5) + (-7/8)

Answer 1

Do the following
find a common denominator 5x8=40
get all your denominator values the same
next solve
(5×15)+(8×2)+(5×(-7))/(40)

so you get this next
75+16-35/(40)

then you have
56/40

which reduces down to
7/5

Answer 2

7/5 is your answer, Hope this helps.