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-9=-9+k/1
We move all terms to the left:
-9-(-9+k/1)=0
We add all the numbers together, and all the variables
-(k/1-9)-9=0
We get rid of parentheses
-k/1+9-9=0
We multiply all the terms by the denominator
-k+9*1-9*1=0
We add all the numbers together, and all the variables
-k=0
k=0/-1
k=0
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