Tīpoka ki ngā ihirangi matua
Whakaoti mō a
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Whakaoti mō c
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Ngā Raru Ōrite mai i te Rapu Tukutuku

Tohaina

a=c-d
Tangohia te d mai i ngā taha e rua.
c=a+d
Whakawhitihia ngā taha kia puta ki te taha mauī ngā kīanga tau taurangi katoa.