Whakaoti i te 30=30+(50-(35+x))div30*10

$$30=30+(50-(35+x)) \div 30 \times 10$$

Whakaoti mō x

$$x=15$$

Ngā Upane mō te Whakaoti Whārite Rārangi

Whakareatia ngā taha e rua o te whārite ki te 30.

$$900=900+\left(50-\left(35+x\right)\right)\times 10$$

Hei kimi i te tauaro o 35+x, kimihia te tauaro o ia taurangi.

$$900=900+\left(50-35-x\right)\times 10$$

Tangohia te 35 i te 50, ka 15.

$$900=900+\left(15-x\right)\times 10$$

Whakamahia te āhuatanga tohatoha hei whakarea te 15-x ki te 10.

$$900=900+150-10x$$

Tāpirihia te 900 ki te 150, ka 1050.

$$900=1050-10x$$

Whakawhitihia ngā taha kia puta ki te taha mauī ngā kīanga tau taurangi katoa.

$$1050-10x=900$$

Tangohia te 1050 mai i ngā taha e rua.

$$-10x=900-1050$$

Tangohia te 1050 i te 900, ka -150.

$$-10x=-150$$

Whakawehea ngā taha e rua ki te -10.

$$x=\frac{-150}{-10}$$

Whakawehea te -150 ki te -10, kia riro ko 15.

$$x=15$$