Whakaoti mō b
b=-1
Tohaina
Kua tāruatia ki te papatopenga
\frac{3}{10}\times 20=b+7
Me whakarea ngā taha e rua ki te 20.
\frac{3\times 20}{10}=b+7
Tuhia te \frac{3}{10}\times 20 hei hautanga kotahi.
\frac{60}{10}=b+7
Whakareatia te 3 ki te 20, ka 60.
6=b+7
Whakawehea te 60 ki te 10, kia riro ko 6.
b+7=6
Whakawhitihia ngā taha kia puta ki te taha mauī ngā kīanga tau taurangi katoa.
b=6-7
Tangohia te 7 mai i ngā taha e rua.
b=-1
Tangohia te 7 i te 6, ka -1.
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