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14x\times \frac{9}{10}-x=390
Whakahekea te hautanga \frac{90}{100} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 10.
\frac{14\times 9}{10}x-x=390
Tuhia te 14\times \frac{9}{10} hei hautanga kotahi.
\frac{126}{10}x-x=390
Whakareatia te 14 ki te 9, ka 126.
\frac{63}{5}x-x=390
Whakahekea te hautanga \frac{126}{10} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 2.
\frac{58}{5}x=390
Pahekotia te \frac{63}{5}x me -x, ka \frac{58}{5}x.
x=390\times \frac{5}{58}
Me whakarea ngā taha e rua ki te \frac{5}{58}, te tau utu o \frac{58}{5}.
x=\frac{390\times 5}{58}
Tuhia te 390\times \frac{5}{58} hei hautanga kotahi.
x=\frac{1950}{58}
Whakareatia te 390 ki te 5, ka 1950.
x=\frac{975}{29}
Whakahekea te hautanga \frac{1950}{58} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 2.