Whakaoti i te 420left(80-xright)=1.68left(x-10right)

$$420 \left( 80-x \right) = 1.68 \left( x-10 \right)$$

Whakaoti mō x

$$x = \frac{20010}{251} = 79\frac{181}{251} \approx 79.721115538$$

Ngā Upane mō te Whakaoti Whārite Rārangi

Whakamahia te āhuatanga tohatoha hei whakarea te 420 ki te 80-x.

$$33600-420x=1.68\left(x-10\right)$$

Whakamahia te āhuatanga tohatoha hei whakarea te 1.68 ki te x-10.

$$33600-420x=1.68x-16.8$$

Tangohia te 1.68x mai i ngā taha e rua.

$$33600-420x-1.68x=-16.8$$

Pahekotia te -420x me -1.68x, ka -421.68x.

$$33600-421.68x=-16.8$$

Tangohia te 33600 mai i ngā taha e rua.

$$-421.68x=-16.8-33600$$

Tangohia te 33600 i te -16.8, ka -33616.8.

$$-421.68x=-33616.8$$

Whakawehea ngā taha e rua ki te -421.68.

$$x=\frac{-33616.8}{-421.68}$$

Whakarohaina te \frac{-33616.8}{-421.68} mā te whakarea i te taurunga me te tauraro ki te 100.

$$x=\frac{-3361680}{-42168}$$

Whakahekea te hautanga \frac{-3361680}{-42168} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te -168.

$$x=\frac{20010}{251}$$