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8k+15=4k+13
We move all terms to the left:
8k+15-(4k+13)=0
We get rid of parentheses
8k-4k-13+15=0
We add all the numbers together, and all the variables
4k+2=0
We move all terms containing k to the left, all other terms to the right
4k=-2
k=-2/4
k=-1/2
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