Solve for m
m=-3
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2m+9+m=0
Add -1 and 10 to get 9.
3m+9=0
Combine 2m and m to get 3m.
3m=-9
Subtract 9 from both sides. Anything subtracted from zero gives its negation.
m=\frac{-9}{3}
Divide both sides by 3.
m=-3
Divide -9 by 3 to get -3.
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