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Tohaina

-2n=9-21
Tangohia te 21 mai i ngā taha e rua.
-2n=-12
Tangohia te 21 i te 9, ka -12.
n=\frac{-12}{-2}
Whakawehea ngā taha e rua ki te -2.
n=6
Whakawehea te -12 ki te -2, kia riro ko 6.