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Tohaina

3a=-12-6
Tangohia te 6 mai i ngā taha e rua.
3a=-18
Tangohia te 6 i te -12, ka -18.
a=\frac{-18}{3}
Whakawehea ngā taha e rua ki te 3.
a=-6
Whakawehea te -18 ki te 3, kia riro ko -6.