
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
Xiao Ying solved the inequality $\frac{1+x}{2}-\frac{2x+1}{3}≤1$ as follows. There is a mistake in one of the steps. Please identify the incorrect step number and provide the correct solution process.  
Solution:  
After clearing the denominators, we get: $3\left(1+x\right)-2\left(2x+1\right)\leqslant 1$ (1),  
Expanding the brackets, we get: $3+3x-4x-2\leqslant 1$ (2),  
Rearranging terms, we get: $3x-4x\leqslant 1-3+2$ (3),  
Combining like terms, we get: $-x\leqslant 0$ (4),  
Dividing both sides by $-1$, we get: $x\geqslant 0$ (5).

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