If the equation of the plane passing through the line of intersection of the planes \( 2x - 7y + 4z - 3 = 0 \), \( 3x - 5y + 4z + 11 = 0 \) and the point \( (-2, 1, 3) \) is \( ax + by + cz - 7 = 0 \), then the value of \( 2a + b + c - 7 \) is _______.
