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7k=8k-8
We move all terms to the left:
7k-(8k-8)=0
We get rid of parentheses
7k-8k+8=0
We add all the numbers together, and all the variables
-1k+8=0
We move all terms containing k to the left, all other terms to the right
-k=-8
k=-8/-1
k=+8
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