The problem asks us to find the missing values $a$, $b$, and $c$ based on the given equations. The equations relate these variables to the numbers in the boxes.

1. Problem Description

The problem asks us to find the missing values $a$, $b$, and $c$ based on the given equations. The equations relate these variables to the numbers in the boxes.

2. Solution Steps

First, we find the value of $a$:

$a = 12 - (7 + 5)$

$a = 12 - 12$

$a = 0$

Second, we find the value of $b$:

$b = 12 - (7 + 3)$

$b = 12 - 10$

$b = 2$

Third, we find the value of $c$:

$c = 12 - (3 + 1)$

$c = 12 - 4$

$c = 8$

3. Final Answer

$a = 0$

$b = 2$

$c = 8$