M+7+l+l=30

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Solution for M+7+l+l=30 equation: 



+7+M+M=30

We move all terms to the left:

+7+M+M-(30)=0

We add all the numbers together, and all the variables

2M-23=0

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

2M=23

M=23/2

M=11+1/2

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