1)
OM-PM+AB-AP=OM+MP+AB+PA=OP+AB+PA=OA+AB=OB
2)
mn+ab+nm+bc+ca=mn+ab-mn+bc+ca=ab+bc+ca=ac+ca=ac-ac=0
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Answers & Comments
1)
OM-PM+AB-AP=OM+MP+AB+PA=OP+AB+PA=OA+AB=OB
2)
mn+ab+nm+bc+ca=mn+ab-mn+bc+ca=ab+bc+ca=ac+ca=ac-ac=0