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But that's not reflected in the diagram. Also if you don't buffer it with an amp for your virtual ground, the resistors can affect the ground.
V3 / R3 = [(Vdd - V3) / R2] + [(V1 - V3) / R1]
V3 = [R1*R3*Vdd + R2*R3*V1] / [R1*(R2+R3)+R2*R3]
V3 = [V1*R2*R3]/[R1*R2 +R3*(R1+R2)] + [Vdd*R1*R3]/[R1*R2 +R3*(R1+R2)]