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(6)=4K-9
We move all terms to the left:
(6)-(4K-9)=0
We get rid of parentheses
-4K+9+6=0
We add all the numbers together, and all the variables
-4K+15=0
We move all terms containing K to the left, all other terms to the right
-4K=-15
K=-15/-4
K=3+3/4
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