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-9k-12=-16-10k
We move all terms to the left:
-9k-12-(-16-10k)=0
We add all the numbers together, and all the variables
-9k-(-10k-16)-12=0
We get rid of parentheses
-9k+10k+16-12=0
We add all the numbers together, and all the variables
k+4=0
We move all terms containing k to the left, all other terms to the right
k=-4
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