
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 $f(x)= \begin{cases} (2a-1)x+3a,x < 1 \\ a^{x},x\geqslant 1 \end{cases}$ satisfies $\frac {f(x_{1})-f(x_{2})}{x_{1}-x_{2}} < 0$ for any $x_{1}\neq x_{2}$, determine the range of values for $a$.

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