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-1=k/7-3
We move all terms to the left:
-1-(k/7-3)=0
We get rid of parentheses
-k/7+3-1=0
We multiply all the terms by the denominator
-k+3*7-1*7=0
We add all the numbers together, and all the variables
-1k+14=0
We move all terms containing k to the left, all other terms to the right
-k=-14
k=-14/-1
k=+14
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