Whakaoti mō S
S=\frac{B}{21}
Whakaoti mō B
B=21S
Tohaina
Kua tāruatia ki te papatopenga
S\times 21=B
Whakawhitihia ngā taha kia puta ki te taha mauī ngā kīanga tau taurangi katoa.
21S=B
He hanga arowhānui tō te whārite.
\frac{21S}{21}=\frac{B}{21}
Whakawehea ngā taha e rua ki te 21.
S=\frac{B}{21}
Mā te whakawehe ki te 21 ka wetekia te whakareanga ki te 21.
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