Question #2e711
2 Answers
Feb 16, 2018
Thus, x=
Feb 16, 2018
6
Explanation:
This can be written as
To make it easier to work with, reorder it as
Now you can subtract 20 from both sides
From here you can divide by -1 then 3, divide by 3 then -1, or divide by negative 3. No matter what you choose, you'll end up with the same answer. I'll show dividing by -3
Therefore, the unknown number is -6. Plug this back into the first equation to check it