Whakaoti i te (30-2x)/30=(20-2)/20

$$\frac{ (30-2x) }{ 30 } = \frac{ (20-2) }{ 20 }$$

Whakaoti mō x

$$x = \frac{3}{2} = 1\frac{1}{2} = 1.5$$

Ngā Upane mō te Whakaoti Whārite Rārangi

Me whakarea ngā taha e rua o te whārite ki te 60, arā, te tauraro pātahi he tino iti rawa te kitea o 30,20.

$$2\left(30-2x\right)=3\left(20-2\right)$$

Whakamahia te āhuatanga tohatoha hei whakarea te 2 ki te 30-2x.

$$60-4x=3\left(20-2\right)$$

Tangohia te 2 i te 20, ka 18.

$$60-4x=3\times 18$$

Whakareatia te 3 ki te 18, ka 54.

$$60-4x=54$$

Tangohia te 60 mai i ngā taha e rua.

$$-4x=54-60$$

Tangohia te 60 i te 54, ka -6.

$$-4x=-6$$

Whakawehea ngā taha e rua ki te -4.

$$x=\frac{-6}{-4}$$

Whakahekea te hautanga \frac{-6}{-4} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te -2.

$$x=\frac{3}{2}$$