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(-12)=10K-15
We move all terms to the left:
(-12)-(10K-15)=0
We add all the numbers together, and all the variables
-(10K-15)-12=0
We get rid of parentheses
-10K+15-12=0
We add all the numbers together, and all the variables
-10K+3=0
We move all terms containing K to the left, all other terms to the right
-10K=-3
K=-3/-10
K=3/10
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