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

Tohaina

c=z-x
Tangohia te x mai i ngā taha e rua.
x=z-c
Tangohia te c mai i ngā taha e rua.