Whakaoti i te 30x+80(0.6-1.2-x)=(1.2-x)*90

$$30x+80(0.6-1.2-x)=(1.2-x) \times 90$$

Whakaoti mō x

$$x=3.9$$

Ngā Upane mō te Whakaoti Whārite Rārangi

Tangohia te 1.2 i te 0.6, ka -0.6.

$$30x+80\left(-0.6-x\right)=\left(1.2-x\right)\times 90$$

Whakamahia te āhuatanga tohatoha hei whakarea te 80 ki te -0.6-x.

$$30x-48-80x=\left(1.2-x\right)\times 90$$

Pahekotia te 30x me -80x, ka -50x.

$$-50x-48=\left(1.2-x\right)\times 90$$

Whakamahia te āhuatanga tohatoha hei whakarea te 1.2-x ki te 90.

$$-50x-48=108-90x$$

Me tāpiri te 90x ki ngā taha e rua.

$$-50x-48+90x=108$$

Pahekotia te -50x me 90x, ka 40x.

$$40x-48=108$$

Me tāpiri te 48 ki ngā taha e rua.

$$40x=108+48$$

Tāpirihia te 108 ki te 48, ka 156.

$$40x=156$$

Whakawehea ngā taha e rua ki te 40.

$$x=\frac{156}{40}$$

Whakahekea te hautanga \frac{156}{40} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 4.

$$x=\frac{39}{10}$$