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Tohaina

4y=2y-2
Whakamahia te āhuatanga tohatoha hei whakarea te 2 ki te y-1.
4y-2y=-2
Tangohia te 2y mai i ngā taha e rua.
2y=-2
Pahekotia te 4y me -2y, ka 2y.
y=\frac{-2}{2}
Whakawehea ngā taha e rua ki te 2.
y=-1
Whakawehea te -2 ki te 2, kia riro ko -1.