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Tohaina

15+y+\frac{15}{3}=18
Whakareatia te 15 ki te \frac{1}{3}, ka \frac{15}{3}.
15+y+5=18
Whakawehea te 15 ki te 3, kia riro ko 5.
20+y=18
Tāpirihia te 15 ki te 5, ka 20.
y=18-20
Tangohia te 20 mai i ngā taha e rua.
y=-2
Tangohia te 20 i te 18, ka -2.