M=400-2y

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Solution for M=400-2y equation: 



=400-2M

We move all terms to the left:

-(400-2M)=0

We add all the numbers together, and all the variables

-(-2M+400)=0

We get rid of parentheses

2M-400=0

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

2M=400

M=400/2

M=200

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