
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 the function $f(x)=mx\ln(x+1)+x+1$, where $m\in\mathbb{R}$.
- (I) If the line $l$ is always tangent to the curve $y=f(x)$ at the same fixed point, find the equation of $l$.
- (II) When $x\geqslant 0$, $f(x)\leqslant e^{x}$, find the range of the real number $m$.

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