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-20-13k=20-11k
We move all terms to the left:
-20-13k-(20-11k)=0
We add all the numbers together, and all the variables
-13k-(-11k+20)-20=0
We get rid of parentheses
-13k+11k-20-20=0
We add all the numbers together, and all the variables
-2k-40=0
We move all terms containing k to the left, all other terms to the right
-2k=40
k=40/-2
k=-20
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