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+12=20.K=15=
We move all terms to the left:
+12-(20.K)=0
We add all the numbers together, and all the variables
-(+20.K)+12=0
We get rid of parentheses
-20.K+12=0
We add all the numbers together, and all the variables
-20K+12=0
We move all terms containing K to the left, all other terms to the right
-20K=-12
K=-12/-20
K=3/5
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