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-9-4k-10=-8k+9
We move all terms to the left:
-9-4k-10-(-8k+9)=0
We add all the numbers together, and all the variables
-4k-(-8k+9)-19=0
We get rid of parentheses
-4k+8k-9-19=0
We add all the numbers together, and all the variables
4k-28=0
We move all terms containing k to the left, all other terms to the right
4k=28
k=28/4
k=7
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