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-6k-4=k+87
We move all terms to the left:
-6k-4-(k+87)=0
We get rid of parentheses
-6k-k-87-4=0
We add all the numbers together, and all the variables
-7k-91=0
We move all terms containing k to the left, all other terms to the right
-7k=91
k=91/-7
k=-13
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