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9k+12=-k+12
We move all terms to the left:
9k+12-(-k+12)=0
We add all the numbers together, and all the variables
9k-(-1k+12)+12=0
We get rid of parentheses
9k+1k-12+12=0
We add all the numbers together, and all the variables
10k=0
k=0/10
k=0
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