Add/Subtract Polynomials

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Simplify $7\left(m^{2}+m\right)-\left(9m^{2}-m+6\right)$

**Answer**

$\;\;\;7\left(m^{2}+m\right)-\left(9m^{2}-m+6\right)$

$=7m^{2}+7m-9m^{2}+m-6$

$=(7m^{2}-9m^{2})+(7m+m)+(-6)$

$=-2m^{2}+8m-6$