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Tohaina

60a=a-20+180
Whakareatia te 3 ki te 60, ka 180.
60a=a+160
Tāpirihia te -20 ki te 180, ka 160.
60a-a=160
Tangohia te a mai i ngā taha e rua.
59a=160
Pahekotia te 60a me -a, ka 59a.
a=\frac{160}{59}
Whakawehea ngā taha e rua ki te 59.