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Whakaoti mō x
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\frac{1}{5}x=64400
Whakahekea te hautanga \frac{20}{100} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 20.
x=64400\times 5
Me whakarea ngā taha e rua ki te 5, te tau utu o \frac{1}{5}.
x=322000
Whakareatia te 64400 ki te 5, ka 322000.