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13=72-k
We move all terms to the left:
13-(72-k)=0
We add all the numbers together, and all the variables
-(-1k+72)+13=0
We get rid of parentheses
1k-72+13=0
We add all the numbers together, and all the variables
k-59=0
We move all terms containing k to the left, all other terms to the right
k=59
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