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= 15m^2 - 25m^2 + 5m - 2m^3 - 8m^2 + 18m
= -2m^3 - 18m^2 + 23m
15 m^ - 25 m^ + 5m - 2m³ + 8m^ - 18 m
- 2m³ +15m^ - 25 m^ + 8 m^ +5m - 18 m
- 2m³ - 2m^ -13 m
^ artinya pangkat2