M+m+m=9

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Solution for M+m+m=9 equation: 



+M+M=9

We move all terms to the left:

+M+M-(9)=0

We add all the numbers together, and all the variables

2M-9=0

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

2M=9

M=9/2

M=4+1/2

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