
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 two parabolas $N\_1$: $y=ax^{2}+bx+c$ and $N\_2$: $y=-ax^{2}+dx+e$ with vertices $P\_1(x\_1,y\_1)$ and $P\_2(x\_2,y\_2)$, respectively. The parabolas intersect at points $A(12,21)$ and $B(28,3)$ (both distinct from the vertices). Determine the value of $\frac{x\_1+x\_2}{y\_1+y\_2}$.

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