
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
Given two polynomials $A=x^{2}-x$, $B=$■$x+1$, where the coefficient ■ is contaminated.
$(1)$ If ■ is $2$, simplify $2A-B$;
$(2)$ If the value of $A-B$ does not contain any $x$ terms, find the value of ■ in the original question.

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