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9k=-4+8k
We move all terms to the left:
9k-(-4+8k)=0
We add all the numbers together, and all the variables
9k-(8k-4)=0
We get rid of parentheses
9k-8k+4=0
We add all the numbers together, and all the variables
k+4=0
We move all terms containing k to the left, all other terms to the right
k=-4
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