8=0.4m-4

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Solution for 8=0.4m-4 equation: 



8=0.4m-4

We move all terms to the left:

8-(0.4m-4)=0

We get rid of parentheses

-0.4m+4+8=0

We add all the numbers together, and all the variables

-0.4m+12=0

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

-0.4m=-12

m=-12/-0.4

m=+30

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