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-3k=-9-4k
We move all terms to the left:
-3k-(-9-4k)=0
We add all the numbers together, and all the variables
-3k-(-4k-9)=0
We get rid of parentheses
-3k+4k+9=0
We add all the numbers together, and all the variables
k+9=0
We move all terms containing k to the left, all other terms to the right
k=-9
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