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13-15=-8k+9k
We move all terms to the left:
13-15-(-8k+9k)=0
We add all the numbers together, and all the variables
-(+k)+13-15=0
We add all the numbers together, and all the variables
-(+k)-2=0
We get rid of parentheses
-k-2=0
We add all the numbers together, and all the variables
-1k-2=0
We move all terms containing k to the left, all other terms to the right
-k=2
k=2/-1
k=-2
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