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-6(k+3)=54
We move all terms to the left:
-6(k+3)-(54)=0
We multiply parentheses
-6k-18-54=0
We add all the numbers together, and all the variables
-6k-72=0
We move all terms containing k to the left, all other terms to the right
-6k=72
k=72/-6
k=-12
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