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-13-6k=7-k
We move all terms to the left:
-13-6k-(7-k)=0
We add all the numbers together, and all the variables
-6k-(-1k+7)-13=0
We get rid of parentheses
-6k+1k-7-13=0
We add all the numbers together, and all the variables
-5k-20=0
We move all terms containing k to the left, all other terms to the right
-5k=20
k=20/-5
k=-4
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