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13=7k+6k
We move all terms to the left:
13-(7k+6k)=0
We add all the numbers together, and all the variables
-(+13k)+13=0
We get rid of parentheses
-13k+13=0
We move all terms containing k to the left, all other terms to the right
-13k=-13
k=-13/-13
k=1
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