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(+3)(M-3)=108
We move all terms to the left:
(+3)(M-3)-(108)=0
We add all the numbers together, and all the variables
3(M-3)-108=0
We multiply parentheses
3M-9-108=0
We add all the numbers together, and all the variables
3M-117=0
We move all terms containing M to the left, all other terms to the right
3M=117
M=117/3
M=39
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