For this case we must explain how to simplify the following expression:
![(-9) (- 6) (15) (- 7 + 7)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/i992cn4l42q6cxk0dv0x5dsn5ippiau0of.png)
According to the PEMDAS algebraic resolution order method, operations within parentheses must be performed first.
So, we have:
![-7 + 7](https://img.qammunity.org/2020/formulas/mathematics/middle-school/d7nruwqeja04khljieatvznutkqhu0cd1l.png)
Different signs are subtracted and the major sign is placed.
![-7 + 7 = 0](https://img.qammunity.org/2020/formulas/mathematics/middle-school/1qr9440ji4zyy2xx0clnc7rdceq3zy5van.png)
Rewriting the original expression we have:
![(-9) (- 6) (15) (0) =](https://img.qammunity.org/2020/formulas/mathematics/middle-school/1pi5qhu6g62ejy74eh0h6d8x0qou0ue6yf.png)
Every number multiplied by "0" results in "0".
Then, the expression is zero.
![(-9) (- 6) (15) (0) = 0](https://img.qammunity.org/2020/formulas/mathematics/middle-school/dusiuia7xjt8jr1dl4fh49ts3pbmun5h82.png)
Answer:
![(-9) (- 6) (15) (- 7 + 7) = 0](https://img.qammunity.org/2020/formulas/mathematics/middle-school/4pxmila0on5tb7op6hlkkbe1qka202ivgx.png)