Whakaoti mō f_1
f_{1}=72
Tohaina
Kua tāruatia ki te papatopenga
46=40+150-2f_{1}
Whakareatia te 30 ki te 5, ka 150.
46=190-2f_{1}
Tāpirihia te 40 ki te 150, ka 190.
190-2f_{1}=46
Whakawhitihia ngā taha kia puta ki te taha mauī ngā kīanga tau taurangi katoa.
-2f_{1}=46-190
Tangohia te 190 mai i ngā taha e rua.
-2f_{1}=-144
Tangohia te 190 i te 46, ka -144.
f_{1}=\frac{-144}{-2}
Whakawehea ngā taha e rua ki te -2.
f_{1}=72
Whakawehea te -144 ki te -2, kia riro ko 72.
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