m(-7)=-28

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Solution for m(-7)=-28 equation: 



m(-7)=-28

We move all terms to the left:

m(-7)-(-28)=0

We add all the numbers together, and all the variables

m(-7)+28=0

We multiply parentheses

-7m+28=0

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

-7m=-28

m=-28/-7

m=+4

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