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