Whakaoti i te 5*20+(x-5)*4=(5*20+44)*0.9

$$5 \times 20 + ( x - 5 ) \times 4 = ( 5 \times 20 + 44 ) \times 0.9$$

Whakaoti mō x

$$x=12.4$$

Ngā Upane mō te Whakaoti Whārite Rārangi

Whakareatia te 5 ki te 20, ka 100.

$$100+\left(x-5\right)\times 4=\left(5\times 20+44\right)\times 0.9$$

Whakamahia te āhuatanga tohatoha hei whakarea te x-5 ki te 4.

$$100+4x-20=\left(5\times 20+44\right)\times 0.9$$

Tangohia te 20 i te 100, ka 80.

$$80+4x=\left(5\times 20+44\right)\times 0.9$$

Whakareatia te 5 ki te 20, ka 100.

$$80+4x=\left(100+44\right)\times 0.9$$

Tāpirihia te 100 ki te 44, ka 144.

$$80+4x=144\times 0.9$$

Whakareatia te 144 ki te 0.9, ka 129.6.

$$80+4x=129.6$$

Tangohia te 80 mai i ngā taha e rua.

$$4x=129.6-80$$

Tangohia te 80 i te 129.6, ka 49.6.

$$4x=49.6$$

Whakawehea ngā taha e rua ki te 4.

$$x=\frac{49.6}{4}$$

Whakarohaina te \frac{49.6}{4} mā te whakarea i te taurunga me te tauraro ki te 10.

$$x=\frac{496}{40}$$

Whakahekea te hautanga \frac{496}{40} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 8.

$$x=\frac{62}{5}$$