Solve for k
k=9
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30-k=\frac{105}{5}
Divide both sides by 5.
30-k=21
Divide 105 by 5 to get 21.
-k=21-30
Subtract 30 from both sides.
-k=-9
Subtract 30 from 21 to get -9.
k=9
Multiply both sides by -1.
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