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-6=21-2M
We move all terms to the left:
-6-(21-2M)=0
We add all the numbers together, and all the variables
-(-2M+21)-6=0
We get rid of parentheses
2M-21-6=0
We add all the numbers together, and all the variables
2M-27=0
We move all terms containing M to the left, all other terms to the right
2M=27
M=27/2
M=13+1/2
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