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-1-10m=-9m-9
We move all terms to the left:
-1-10m-(-9m-9)=0
We get rid of parentheses
-10m+9m+9-1=0
We add all the numbers together, and all the variables
-1m+8=0
We move all terms containing m to the left, all other terms to the right
-m=-8
m=-8/-1
m=+8
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