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Collect like terms and simplify the expr...

Collect like terms and simplify the expression : `12m^2-9m+5m-4m^2-7m+10`

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`12m^2 - 9m + 5m- 4m^2 -7m + 10`
`= 12m^2 - 4m^2 - 9m+ 5m - 7m + 10`
`= m^2[12-4] + m[-9+5-7] + 10`
`= 8m^2-11m+ 10`
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