Solve for K
K=-6
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9-2K=21
Swap sides so that all variable terms are on the left hand side.
-2K=21-9
Subtract 9 from both sides.
-2K=12
Subtract 9 from 21 to get 12.
K=\frac{12}{-2}
Divide both sides by -2.
K=-6
Divide 12 by -2 to get -6.
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