Problem: 6|-3|-4|5| Whenever something is in: |21| in the lines, you would just count the number itself. So it is: 6·3-4·5 which would equal: 6·3-4·5 The answer to 6·3 is 18, so its 18 minus the answer of 5·4 which is 20. So its: 18-20= -2 ~Hope i helped. :)
