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11=-9-4k
We move all terms to the left:
11-(-9-4k)=0
We add all the numbers together, and all the variables
-(-4k-9)+11=0
We get rid of parentheses
4k+9+11=0
We add all the numbers together, and all the variables
4k+20=0
We move all terms containing k to the left, all other terms to the right
4k=-20
k=-20/4
k=-5
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