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9m-2m=3m-4m
We move all terms to the left:
9m-2m-(3m-4m)=0
We add all the numbers together, and all the variables
9m-2m-(-1m)=0
We add all the numbers together, and all the variables
7m-(-1m)=0
We get rid of parentheses
7m+1m=0
We add all the numbers together, and all the variables
8m=0
m=0/8
m=0
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