Question

13-6+8=    14-9+6=   80-(12-7)=     90-(14-8)=     

Answer 1

13-6+8=7+8=15
14-9+6=5+6=11
80-(12-7)=80-5=75
90-(14-8)=90-6=84

Answer 2

Let's calculate the equations:

1. 13 - 6 + 8 = 15
2. 14 - 9 + 6 = 11
3. 80 - (12 - 7) = 75
4. 90 - (14 - 8) = 84