A beam of 11 in. width and effective depth of 16 in. carries a factored uniformly distributed load of 5.3 kips ft, including its own weight, in addition to a central, concentrated factored load of 12 kips. It spans 18 ft, and restraining end moments at full factored load are 137 ft-kips at each support. It is rein- forced with three No. 9 (No. 29) bars for both positive and negative bending. If fc′ = 4000 psi, through what part of the beam is web reinforcement theoretically require (a) if Eq. (5.12d) is used? (b) if Eqs. (5.12a) through (5.12c) are used?