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-8-4k=-10k+10
We move all terms to the left:
-8-4k-(-10k+10)=0
We get rid of parentheses
-4k+10k-10-8=0
We add all the numbers together, and all the variables
6k-18=0
We move all terms containing k to the left, all other terms to the right
6k=18
k=18/6
k=3
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