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m+7=3+m+m+4
We move all terms to the left:
m+7-(3+m+m+4)=0
We add all the numbers together, and all the variables
m-(2m+7)+7=0
We get rid of parentheses
m-2m-7+7=0
We add all the numbers together, and all the variables
-m=0
m=0/-1
m=0
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