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5k-7=k-15
We move all terms to the left:
5k-7-(k-15)=0
We get rid of parentheses
5k-k+15-7=0
We add all the numbers together, and all the variables
4k+8=0
We move all terms containing k to the left, all other terms to the right
4k=-8
k=-8/4
k=-2
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