-5 – [-17 + (15 -6)] + (-15 - 8) – {-1 + (8 - 9) + (7 - 10)}

-15

-5 – [-17 + (15 -6)] + (-15 - 8) – {-1 + (8 - 9) + (7 - 10)}

-5-(-17+9)+(-23)-(-1+(-1)+(-3))

-5-(-8)-23-(-1-1-3)

-5+8-23-(-5)

-5+8-23+5

=-15

astronomers is your final answer! : )

it shoild be o

step-by-step explanation: