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-8k-9=-10-6k-9
We move all terms to the left:
-8k-9-(-10-6k-9)=0
We add all the numbers together, and all the variables
-8k-(-6k-19)-9=0
We get rid of parentheses
-8k+6k+19-9=0
We add all the numbers together, and all the variables
-2k+10=0
We move all terms containing k to the left, all other terms to the right
-2k=-10
k=-10/-2
k=+5
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