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4k=5k-9
We move all terms to the left:
4k-(5k-9)=0
We get rid of parentheses
4k-5k+9=0
We add all the numbers together, and all the variables
-1k+9=0
We move all terms containing k to the left, all other terms to the right
-k=-9
k=-9/-1
k=+9
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