M-m+3m-m=20

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Solution for M-m+3m-m=20 equation: 



-M+3M-M=20

We move all terms to the left:

-M+3M-M-(20)=0

We add all the numbers together, and all the variables

M-20=0

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

M=20

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