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-2m+-7=+1
We move all terms to the left:
-2m+-7-(+1)=0
We add all the numbers together, and all the variables
-2m-7+-1=0
We add all the numbers together, and all the variables
-2m-8=0
We move all terms containing m to the left, all other terms to the right
-2m=8
m=8/-2
m=-4
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