Whakaoti mō x
x=18
Graph
Tohaina
Kua tāruatia ki te papatopenga
7x-21=5\left(x+3\right)
Whakamahia te āhuatanga tohatoha hei whakarea te 7 ki te x-3.
7x-21=5x+15
Whakamahia te āhuatanga tohatoha hei whakarea te 5 ki te x+3.
7x-21-5x=15
Tangohia te 5x mai i ngā taha e rua.
2x-21=15
Pahekotia te 7x me -5x, ka 2x.
2x=15+21
Me tāpiri te 21 ki ngā taha e rua.
2x=36
Tāpirihia te 15 ki te 21, ka 36.
x=\frac{36}{2}
Whakawehea ngā taha e rua ki te 2.
x=18
Whakawehea te 36 ki te 2, kia riro ko 18.
Ngā Tauira
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