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-8k+15=-4k-1
We move all terms to the left:
-8k+15-(-4k-1)=0
We get rid of parentheses
-8k+4k+1+15=0
We add all the numbers together, and all the variables
-4k+16=0
We move all terms containing k to the left, all other terms to the right
-4k=-16
k=-16/-4
k=+4
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