Whakaoti i te 3(y+2)-7(y+4)=-7-y

$$3 ( y + 2 ) - 7 ( y + 4 ) = - 7 - y$$

Whakaoti mō y

$$y=-5$$

Ngā Upane mō te Whakaoti Whārite Rārangi

Whakamahia te āhuatanga tohatoha hei whakarea te 3 ki te y+2.

$$3y+6-7\left(y+4\right)=-7-y$$

Whakamahia te āhuatanga tohatoha hei whakarea te -7 ki te y+4.

$$3y+6-7y-28=-7-y$$

Pahekotia te 3y me -7y, ka -4y.

$$-4y+6-28=-7-y$$

Tangohia te 28 i te 6, ka -22.

$$-4y-22=-7-y$$

Me tāpiri te y ki ngā taha e rua.

$$-4y-22+y=-7$$

Pahekotia te -4y me y, ka -3y.

$$-3y-22=-7$$

Me tāpiri te 22 ki ngā taha e rua.

$$-3y=-7+22$$

Tāpirihia te -7 ki te 22, ka 15.

$$-3y=15$$

Whakawehea ngā taha e rua ki te -3.

$$y=\frac{15}{-3}$$

Whakawehea te 15 ki te -3, kia riro ko -5.

$$y=-5$$