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Whakaoti mō x
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Tohaina

\frac{2.1}{0.7}=x
Whakawehea ngā taha e rua ki te 0.7.
\frac{21}{7}=x
Whakarohaina te \frac{2.1}{0.7} mā te whakarea i te taurunga me te tauraro ki te 10.
3=x
Whakawehea te 21 ki te 7, kia riro ko 3.
x=3
Whakawhitihia ngā taha kia puta ki te taha mauī ngā kīanga tau taurangi katoa.