
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
When Xiaoqiang solved the system of equations $\left\{\begin{array}{l}{2x-y=●}\\{3x+y=8}\end{array}\right.$, he found that the solution to the system of equations is $\left\{\begin{array}{l}{x=◆}\\{y=-1}\end{array}\right.$. Due to an accident, some ink accidentally dripped onto his workbook, covering the numbers at the ● and ◆ positions. Therefore, the number represented by ● should be ______.

Present the answer in LaTex format: \boxed{Your answer}
user