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Whakaoti mō b
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Tohaina

\frac{30}{2}=7+b
Whakawehea ngā taha e rua ki te 2.
15=7+b
Whakawehea te 30 ki te 2, kia riro ko 15.
7+b=15
Whakawhitihia ngā taha kia puta ki te taha mauī ngā kīanga tau taurangi katoa.
b=15-7
Tangohia te 7 mai i ngā taha e rua.
b=8
Tangohia te 7 i te 15, ka 8.