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