
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
Suppose that the symbol \(\triangle\) now represents the operation \(2a + b - c\). For example, if we have numbers 3, 5, and 2 at the vertices of a triangle, then the result of this operation is \(2*3 + 5 - 2 = 9\). Calculate the sum of the following three triangles with vertices labeled as:
1. \(1, 2, 3\)
2. \(4, 6, 5\)
3. \(2, 7, 1\)
A) 19
B) 20
C) 21
D) 22
E) 23

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