Whakaoti i te (x-100)*(80*4200)+800*4200*(-50)=0

$$( x - 100 ) \times ( 80 \times 4200 ) + 800 \times 4200 \times ( - 50 ) = 0$$

Whakaoti mō x

$$x=600$$

Ngā Upane mō te Whakaoti Whārite Rārangi

Whakareatia te 80 ki te 4200, ka 336000.

$$\left(x-100\right)\times 336000+800\times 4200\left(-50\right)=0$$

Whakamahia te āhuatanga tohatoha hei whakarea te x-100 ki te 336000.

$$336000x-33600000+800\times 4200\left(-50\right)=0$$

Whakareatia te 800 ki te 4200, ka 3360000.

$$336000x-33600000+3360000\left(-50\right)=0$$

Whakareatia te 3360000 ki te -50, ka -168000000.

$$336000x-33600000-168000000=0$$

Tangohia te 168000000 i te -33600000, ka -201600000.

$$336000x-201600000=0$$

Me tāpiri te 201600000 ki ngā taha e rua. Ko te tau i tāpiria he kore ka hua koia tonu.

$$336000x=201600000$$

Whakawehea ngā taha e rua ki te 336000.

$$x=\frac{201600000}{336000}$$

Whakawehea te 201600000 ki te 336000, kia riro ko 600.

$$x=600$$