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7-15=-1k
We move all terms to the left:
7-15-(-1k)=0
We add all the numbers together, and all the variables
-(-1k)-8=0
We get rid of parentheses
1k-8=0
We add all the numbers together, and all the variables
k-8=0
We move all terms containing k to the left, all other terms to the right
k=8
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