Whakaoti i te 500*1*(87-90)+K(87-12)=0

$$500 \times 1 \times ( 87 - 90 ) + K ( 87 - 12 ) = 0$$

Whakaoti mō K

$$K=20$$

Ngā Upane mō te Whakaoti Whārite Rārangi

Whakareatia te 500 ki te 1, ka 500.

$$500\left(87-90\right)+K\left(87-12\right)=0$$

Tangohia te 90 i te 87, ka -3.

$$500\left(-3\right)+K\left(87-12\right)=0$$

Whakareatia te 500 ki te -3, ka -1500.

$$-1500+K\left(87-12\right)=0$$

Tangohia te 12 i te 87, ka 75.

$$-1500+K\times 75=0$$

Me tāpiri te 1500 ki ngā taha e rua. Ko te tau i tāpiria he kore ka hua koia tonu.

$$K\times 75=1500$$

Whakawehea ngā taha e rua ki te 75.

$$K=\frac{1500}{75}$$

Whakawehea te 1500 ki te 75, kia riro ko 20.

$$K=20$$