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Whakaoti mō x
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Tohaina

3x+39=10\left(x-1\right)
Whakamahia te āhuatanga tohatoha hei whakarea te 3 ki te x+13.
3x+39=10x-10
Whakamahia te āhuatanga tohatoha hei whakarea te 10 ki te x-1.
3x+39-10x=-10
Tangohia te 10x mai i ngā taha e rua.
-7x+39=-10
Pahekotia te 3x me -10x, ka -7x.
-7x=-10-39
Tangohia te 39 mai i ngā taha e rua.
-7x=-49
Tangohia te 39 i te -10, ka -49.
x=\frac{-49}{-7}
Whakawehea ngā taha e rua ki te -7.
x=7
Whakawehea te -49 ki te -7, kia riro ko 7.