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5k-9=-4k+9
We move all terms to the left:
5k-9-(-4k+9)=0
We get rid of parentheses
5k+4k-9-9=0
We add all the numbers together, and all the variables
9k-18=0
We move all terms containing k to the left, all other terms to the right
9k=18
k=18/9
k=2
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