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-5=7-k
We move all terms to the left:
-5-(7-k)=0
We add all the numbers together, and all the variables
-(-1k+7)-5=0
We get rid of parentheses
1k-7-5=0
We add all the numbers together, and all the variables
k-12=0
We move all terms containing k to the left, all other terms to the right
k=12
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