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-56=7-7k
We move all terms to the left:
-56-(7-7k)=0
We add all the numbers together, and all the variables
-(-7k+7)-56=0
We get rid of parentheses
7k-7-56=0
We add all the numbers together, and all the variables
7k-63=0
We move all terms containing k to the left, all other terms to the right
7k=63
k=63/7
k=9
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