Compute the flux of the vector field F→ = 6xi→ + yj→ + zk→ through the surface S, where S is the part of the surface z = −7x − 14y + 1, oriented upward, with (x, y) in the triangle R with vertices (0, 0), (0, 12), (3, 0). Enter an exact answer. ∫SF→⋅dA→ =