Solve for k
k=-50
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k=-20\times \frac{5}{2}
Multiply both sides by \frac{5}{2}, the reciprocal of \frac{2}{5}.
k=\frac{-20\times 5}{2}
Express -20\times \frac{5}{2} as a single fraction.
k=\frac{-100}{2}
Multiply -20 and 5 to get -100.
k=-50
Divide -100 by 2 to get -50.
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