
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
The equation of line $l$ is $(a+1)x+y+2-a=0$ ($a\in \mathbb{R}$).

(1) If $l$ has equal intercepts on both coordinate axes, find the value of $a$;

(2) If $l$ does not pass through the second quadrant, find the range of the real number $a$.

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