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-144-12=-12k
We move all terms to the left:
-144-12-(-12k)=0
We add all the numbers together, and all the variables
-(-12k)-156=0
We get rid of parentheses
12k-156=0
We move all terms containing k to the left, all other terms to the right
12k=156
k=156/12
k=13
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