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-7=5k+4k
We move all terms to the left:
-7-(5k+4k)=0
We add all the numbers together, and all the variables
-(+9k)-7=0
We get rid of parentheses
-9k-7=0
We move all terms containing k to the left, all other terms to the right
-9k=7
k=7/-9
k=-7/9
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