
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 a line $l$ passing through point $P(m,n)$ and perpendicular to the line $l_{0}: x+2y+4=0$.

(Ⅰ) If $m= \frac {1}{2}$ and point $P$ is on the graph of the function $y= \frac {1}{1-x}$, find the general form equation of line $l$;  
(Ⅱ) If point $P(m,n)$ is on the line $l_{0}$, determine whether the line $mx+(n-1)y+n+5=0$ passes through a fixed point. If so, find the coordinates of the fixed point; otherwise, explain why.

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