If we substitute the values into the equation, we get:
DF + FM + DM = 28DF + 36 + DM = 28DF + DM = -8
Therefore, FM = -8.
If we substitute the values into the equation, we get:
DF + FM + DM = 28
DF + 36 + DM = 28
DF + DM = -8
Therefore, FM = -8.