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-12=-9+k
We move all terms to the left:
-12-(-9+k)=0
We add all the numbers together, and all the variables
-(k-9)-12=0
We get rid of parentheses
-k+9-12=0
We add all the numbers together, and all the variables
-1k-3=0
We move all terms containing k to the left, all other terms to the right
-k=3
k=3/-1
k=-3
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