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-4=-9+K
We move all terms to the left:
-4-(-9+K)=0
We add all the numbers together, and all the variables
-(K-9)-4=0
We get rid of parentheses
-K+9-4=0
We add all the numbers together, and all the variables
-1K+5=0
We move all terms containing K to the left, all other terms to the right
-K=-5
K=-5/-1
K=+5
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