No I haven't, thrust is an energy input. Which is dependent on multiple variables which the question hasn't mentioned so we can presume are fixed.
And this is for a steady state system. So for a fixed energy input which we have agreed because both answers include Max thrust the plane must be converting the same amount of energy as drag as the energy input of the thrust.
If we change any variables so that the max thrust changes the drag will alter to that energy output And so the max drag would also vary.
At zero airspeed is the system steady state or will it accelerate?