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Tohaina

-20+\frac{2\times 400-4\times 49\times 12}{2}\times 449
Tātaihia te -20 mā te pū o 2, kia riro ko 400.
-20+\frac{800-4\times 49\times 12}{2}\times 449
Whakareatia te 2 ki te 400, ka 800.
-20+\frac{800-196\times 12}{2}\times 449
Whakareatia te 4 ki te 49, ka 196.
-20+\frac{800-2352}{2}\times 449
Whakareatia te 196 ki te 12, ka 2352.
-20+\frac{-1552}{2}\times 449
Tangohia te 2352 i te 800, ka -1552.
-20-776\times 449
Whakawehea te -1552 ki te 2, kia riro ko -776.
-20-348424
Whakareatia te -776 ki te 449, ka -348424.
-348444
Tangohia te 348424 i te -20, ka -348444.