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Tohaina

3k-5-7k=-21
Tangohia te 7k mai i ngā taha e rua.
-4k-5=-21
Pahekotia te 3k me -7k, ka -4k.
-4k=-21+5
Me tāpiri te 5 ki ngā taha e rua.
-4k=-16
Tāpirihia te -21 ki te 5, ka -16.
k=\frac{-16}{-4}
Whakawehea ngā taha e rua ki te -4.
k=4
Whakawehea te -16 ki te -4, kia riro ko 4.