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-12-9k=20-13k
We move all terms to the left:
-12-9k-(20-13k)=0
We add all the numbers together, and all the variables
-9k-(-13k+20)-12=0
We get rid of parentheses
-9k+13k-20-12=0
We add all the numbers together, and all the variables
4k-32=0
We move all terms containing k to the left, all other terms to the right
4k=32
k=32/4
k=8
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