Whakaoti i te 15(x+1)-7(x+9)=4x

$$15 ( x + 1 ) - 7 ( x + 9 ) = 4 x$$

Whakaoti mō x

$$x=12$$

Ngā Upane mō te Whakaoti Whārite Rārangi

Whakamahia te āhuatanga tohatoha hei whakarea te 15 ki te x+1.

$$15x+15-7\left(x+9\right)=4x$$

Whakamahia te āhuatanga tohatoha hei whakarea te -7 ki te x+9.

$$15x+15-7x-63=4x$$

Pahekotia te 15x me -7x, ka 8x.

$$8x+15-63=4x$$

Tangohia te 63 i te 15, ka -48.

$$8x-48=4x$$

Tangohia te 4x mai i ngā taha e rua.

$$8x-48-4x=0$$

Pahekotia te 8x me -4x, ka 4x.

$$4x-48=0$$

Me tāpiri te 48 ki ngā taha e rua. Ko te tau i tāpiria he kore ka hua koia tonu.

$$4x=48$$

Whakawehea ngā taha e rua ki te 4.

$$x=\frac{48}{4}$$

Whakawehea te 48 ki te 4, kia riro ko 12.

$$x=12$$