-9=m-1

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Solution for -9=m-1 equation: 



-9=m-1

We move all terms to the left:

-9-(m-1)=0

We get rid of parentheses

-m+1-9=0

We add all the numbers together, and all the variables

-1m-8=0

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

-m=8

m=8/-1

m=-8

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