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5-7k=4+9
We move all terms to the left:
5-7k-(4+9)=0
We add all the numbers together, and all the variables
-7k+5-13=0
We add all the numbers together, and all the variables
-7k-8=0
We move all terms containing k to the left, all other terms to the right
-7k=8
k=8/-7
k=-1+1/7
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