7+9m=20

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Solution for 7+9m=20 equation: 



7+9m=20

We move all terms to the left:

7+9m-(20)=0

We add all the numbers together, and all the variables

9m-13=0

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

9m=13

m=13/9

m=1+4/9

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