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17=15+k
We move all terms to the left:
17-(15+k)=0
We add all the numbers together, and all the variables
-(k+15)+17=0
We get rid of parentheses
-k-15+17=0
We add all the numbers together, and all the variables
-1k+2=0
We move all terms containing k to the left, all other terms to the right
-k=-2
k=-2/-1
k=+2
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