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yg hilang dalam lingkaran pertama :
(- 8 + 15m) + x = 10 - 6m
x = 10 + 8 - 6m - 15m
x = 18 - 21m (lingkaran kosong pertama di atas)
lingkaran kosong tengah :
(7 - 5m) + (- 8 + 15m) = 7 - 8 - 5m + 15m
= -1 + 10m
lingkaran kosong bawah :
(- 1 + 10m) + (10 - 6m) = -1 + 10 + 10m - 6m
= 9 + 4m