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3(2-)=-3K+2*
We move all terms to the left:
3(2-)-(-3K+2*)=0
We add all the numbers together, and all the variables
-(-3K)+30=0
We get rid of parentheses
3K+30=0
We move all terms containing K to the left, all other terms to the right
3K=-30
K=-30/3
K=-10
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