M-2m+1=7

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Solution for M-2m+1=7 equation: 



-2M+1=7

We move all terms to the left:

-2M+1-(7)=0

We add all the numbers together, and all the variables

-2M-6=0

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

-2M=6

M=6/-2

M=-3

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