
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 that the solution set for the inequality $2x-a<0$ is $A$, and the solution set for the inequality $x^2-(3+a)x+2(1+a)\geq0$ is $B$.
(I) When $a=-4$, find $A\cup B$;
(II) If $A\cap B=A$, find the range of values for the real number $a$.

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