subtract:5m³ – 3m² + 7m – 8 from 8m³-9m² +5m -2
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8m³ -9m² +5m. -2
( - ) 5m³ – 3m² + 7m – 8
-2m2 -6m +2m + 6
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(8m cube - 9m square+5 m) - (5m cube - 3 m square +7m)
(8m cube - 5m cube)+(-9m square+3m square)+(5m-7m)
(3m cube)+(-6m square)+(-2m)
3m cube-6m square-2m
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