Whakaoti mō N
N=\frac{P-1800}{20}
Whakaoti mō P
P=20\left(N+90\right)
Tohaina
Kua tāruatia ki te papatopenga
20N+1800=P
Whakawhitihia ngā taha kia puta ki te taha mauī ngā kīanga tau taurangi katoa.
20N=P-1800
Tangohia te 1800 mai i ngā taha e rua.
\frac{20N}{20}=\frac{P-1800}{20}
Whakawehea ngā taha e rua ki te 20.
N=\frac{P-1800}{20}
Mā te whakawehe ki te 20 ka wetekia te whakareanga ki te 20.
N=\frac{P}{20}-90
Whakawehe P-1800 ki te 20.
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