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