If the equation of the plane passing through the line of intersection of the planes \( 2x - y + z = 3 \), \( 4x - 3y + 5z + 9 = 0 \) and parallel to the line \( \dfrac{x+1}{-2} = \dfrac{y+3}{4} = \dfrac{z-2}{5} \) is \( ax + by + cz + 6 = 0 \), then \( a + b + c \) is equal to:
