9=0.4m+3

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Solution for 9=0.4m+3 equation: 



9=0.4m+3

We move all terms to the left:

9-(0.4m+3)=0

We get rid of parentheses

-0.4m-3+9=0

We add all the numbers together, and all the variables

-0.4m+6=0

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

-0.4m=-6

m=-6/-0.4

m=+15

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