The operational amplifier having the lowest input signal will draw sufficient current from {HEAD ~ V+} to bring the value of line 15 to {TAIL ~ that potential} 
The operational amplifier having the lowest input signal will draw sufficient current from { HEAD ~ V+ } to bring the value of line 15 to { TAIL ~ that potential }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL