
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
Let $S_{n}$ be the sum of the first $n$ terms of the sequence ${a_{n}}$, given that $2a_{n}-2=S_{n}$, $n∈\mathbb{N}^{*}$.
(I) Find the general term formula for the sequence ${a_{n}}$;
(II) Find the sum of the first $n$ terms of the sequence ${na_{n}}$.

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