Radio Shack EC-2037 Owner's Manual page 12

Example:
2392 + 576
————— – 73 = –64.61582
786 – 432
You Press
ON/C MC
786 M+
432 M–
2392 +
576 ÷
MR
–
73 =
12
You See
0.
M 786.
M 432.
,
M 2 392.
,
M 2 968.
M 354.
M 8.38418079
M –64.61581921