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8-2n=\frac{140}{7}
Whakawehea ngā taha e rua ki te 7.
8-2n=20
Whakawehea te 140 ki te 7, kia riro ko 20.
-2n=20-8
Tangohia te 8 mai i ngā taha e rua.
-2n=12
Tangohia te 8 i te 20, 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.