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9k=4k-20
We move all terms to the left:
9k-(4k-20)=0
We get rid of parentheses
9k-4k+20=0
We add all the numbers together, and all the variables
5k+20=0
We move all terms containing k to the left, all other terms to the right
5k=-20
k=-20/5
k=-4
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