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-2k+15=1-k+7
We move all terms to the left:
-2k+15-(1-k+7)=0
We add all the numbers together, and all the variables
-2k-(-1k+8)+15=0
We get rid of parentheses
-2k+1k-8+15=0
We add all the numbers together, and all the variables
-1k+7=0
We move all terms containing k to the left, all other terms to the right
-k=-7
k=-7/-1
k=+7
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