M-9=-b

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Solution for M-9=-b equation: 



-9=-M

We move all terms to the left:

-9-(-M)=0

We add all the numbers together, and all the variables

-(-1M)-9=0

We get rid of parentheses

1M-9=0

We add all the numbers together, and all the variables

M-9=0

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

M=9

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