M-7=9-m

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Solution for M-7=9-m equation: 



-7=9-M

We move all terms to the left:

-7-(9-M)=0

We add all the numbers together, and all the variables

-(-1M+9)-7=0

We get rid of parentheses

1M-9-7=0

We add all the numbers together, and all the variables

M-16=0

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

M=16

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