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55-8k=15+12k
We move all terms to the left:
55-8k-(15+12k)=0
We add all the numbers together, and all the variables
-8k-(12k+15)+55=0
We get rid of parentheses
-8k-12k-15+55=0
We add all the numbers together, and all the variables
-20k+40=0
We move all terms containing k to the left, all other terms to the right
-20k=-40
k=-40/-20
k=+2
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