Whakaoti i te (x+25)*80%=14

$$(x+25) \times 80 \% =14$$

Whakaoti mō x

$$x = -\frac{15}{2} = -7\frac{1}{2} = -7.5$$

Ngā Upane mō te Whakaoti Whārite Rārangi

Whakahekea te hautanga \frac{80}{100} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 20.

$$\left(x+25\right)\times \frac{4}{5}=14$$

Whakamahia te āhuatanga tohatoha hei whakarea te x+25 ki te \frac{4}{5}.

$$x\times \frac{4}{5}+25\times \frac{4}{5}=14$$

Tuhia te 25\times \frac{4}{5} hei hautanga kotahi.

$$x\times \frac{4}{5}+\frac{25\times 4}{5}=14$$

Whakareatia te 25 ki te 4, ka 100.

$$x\times \frac{4}{5}+\frac{100}{5}=14$$

Whakawehea te 100 ki te 5, kia riro ko 20.

$$x\times \frac{4}{5}+20=14$$

Tangohia te 20 mai i ngā taha e rua.

$$x\times \frac{4}{5}=14-20$$

Tangohia te 20 i te 14, ka -6.

$$x\times \frac{4}{5}=-6$$

Me whakarea ngā taha e rua ki te \frac{5}{4}, te tau utu o \frac{4}{5}.

$$x=-6\times \frac{5}{4}$$

Tuhia te -6\times \frac{5}{4} hei hautanga kotahi.

$$x=\frac{-6\times 5}{4}$$

Whakareatia te -6 ki te 5, ka -30.

$$x=\frac{-30}{4}$$

Whakahekea te hautanga \frac{-30}{4} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te 2.

$$x=-\frac{15}{2}$$