P₁=MK+KS+MS=12+6+MS=18+MS
P₂=MS+SN+MN=MS+6+MN
P₁-P₂=18+MS-(MS+6+MN)=18+MS-MS-6-MN=12-MN
12-MN=3
MN=12-3=9
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P₁=MK+KS+MS=12+6+MS=18+MS
P₂=MS+SN+MN=MS+6+MN
P₁-P₂=18+MS-(MS+6+MN)=18+MS-MS-6-MN=12-MN
12-MN=3
MN=12-3=9