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-1=-2m+9
We move all terms to the left:
-1-(-2m+9)=0
We get rid of parentheses
2m-9-1=0
We add all the numbers together, and all the variables
2m-10=0
We move all terms containing m to the left, all other terms to the right
2m=10
m=10/2
m=5
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