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Tohaina

234-y=207
Tāpirihia te 180 ki te 54, ka 234.
-y=207-234
Tangohia te 234 mai i ngā taha e rua.
-y=-27
Tangohia te 234 i te 207, ka -27.
y=27
Me whakarea ngā taha e rua ki te -1.