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Tohaina

9-4n+n=18
Me tāpiri te n ki ngā taha e rua.
9-3n=18
Pahekotia te -4n me n, ka -3n.
-3n=18-9
Tangohia te 9 mai i ngā taha e rua.
-3n=9
Tangohia te 9 i te 18, ka 9.
n=\frac{9}{-3}
Whakawehea ngā taha e rua ki te -3.
n=-3
Whakawehea te 9 ki te -3, kia riro ko -3.