7=9+-3m

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Solution for 7=9+-3m equation: 



7=9+-3m

We move all terms to the left:

7-(9+-3m)=0

We add all the numbers together, and all the variables

-(-3m)+7=0

We get rid of parentheses

3m+7=0

We move all terms containing m to the left, all other terms to the right

3m=-7

m=-7/3

m=-2+1/3

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