Question

7) – 12 – ( + 15 – 20 – 12 + 10 ) =
8) 25 + ( - 9 – 12 – 21 ) – ( - 8 – 16 – 6 ) =
9) + ( - 40 ) – ( - 50 ) + ( + 30 ) – ( + 20 ) =
10) -5 + 9 - 15 + (- 18 + 17 – 11 ) + 30 – 15 =

Answer 1

7) -25

8) 13

9) 20

10) -8

Esas son las soluciones, espero te sirva :)