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28=-1k+16-2k-9=
We move all terms to the left:
28-(-1k+16-2k-9)=0
We add all the numbers together, and all the variables
-(-3k+7)+28=0
We get rid of parentheses
3k-7+28=0
We add all the numbers together, and all the variables
3k+21=0
We move all terms containing k to the left, all other terms to the right
3k=-21
k=-21/3
k=-7
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