3m2-6m+(7m2+9m)
Remove parentheses.
3m2-6m+7m2+9m
Add 3m2 and 7m2.
10m2-6m+9m
Add -6m and 9m.
10m2+3m
Simplify 3m^2-6m+(7m^2+9m)
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Simplify 3m^2-6m+(7m^2+9m)