Whakaoti i te -7/5x+21/5=-667/90

$$- \frac { 7 } { 5 } x + 2 \frac { 1 } { 5 } = - 6 \frac { 67 } { 90 }$$

Whakaoti mō x

$$x = \frac{115}{18} = 6\frac{7}{18} \approx 6.388888889$$

Ngā Upane mō te Whakaoti Whārite Rārangi

Me whakarea ngā taha e rua o te whārite ki te 90, arā, te tauraro pātahi he tino iti rawa te kitea o 5,90.

$$-126x+18\left(2\times 5+1\right)=-\left(6\times 90+67\right)$$

Whakareatia te 2 ki te 5, ka 10.

$$-126x+18\left(10+1\right)=-\left(6\times 90+67\right)$$

Tāpirihia te 10 ki te 1, ka 11.

$$-126x+18\times 11=-\left(6\times 90+67\right)$$

Whakareatia te 18 ki te 11, ka 198.

$$-126x+198=-\left(6\times 90+67\right)$$

Whakareatia te 6 ki te 90, ka 540.

$$-126x+198=-\left(540+67\right)$$

Tāpirihia te 540 ki te 67, ka 607.

$$-126x+198=-607$$

Tangohia te 198 mai i ngā taha e rua.

$$-126x=-607-198$$

Tangohia te 198 i te -607, ka -805.

$$-126x=-805$$

Whakawehea ngā taha e rua ki te -126.

$$x=\frac{-805}{-126}$$

Whakahekea te hautanga \frac{-805}{-126} ki ōna wāhi pāpaku rawa mā te tango me te whakakore i te -7.

$$x=\frac{115}{18}$$