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

Tohaina

-x=50-90
Tangohia te 90 mai i ngā taha e rua.
-x=-40
Tangohia te 90 i te 50, ka -40.
x=40
Me whakarea ngā taha e rua ki te -1.