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-2x-1=-9-x=
We move all terms to the left:
-2x-1-(-9-x)=0
We add all the numbers together, and all the variables
-2x-(-1x-9)-1=0
We get rid of parentheses
-2x+1x+9-1=0
We add all the numbers together, and all the variables
-1x+8=0
We move all terms containing x to the left, all other terms to the right
-x=-8
x=-8/-1
x=+8
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