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-4+9=15+2K
We move all terms to the left:
-4+9-(15+2K)=0
We add all the numbers together, and all the variables
-(2K+15)-4+9=0
We add all the numbers together, and all the variables
-(2K+15)+5=0
We get rid of parentheses
-2K-15+5=0
We add all the numbers together, and all the variables
-2K-10=0
We move all terms containing K to the left, all other terms to the right
-2K=10
K=10/-2
K=-5
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