Solve for f
f=15
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f=9\times \frac{5}{3}
Multiply both sides by \frac{5}{3}, the reciprocal of \frac{3}{5}.
f=\frac{9\times 5}{3}
Express 9\times \frac{5}{3} as a single fraction.
f=\frac{45}{3}
Multiply 9 and 5 to get 45.
f=15
Divide 45 by 3 to get 15.
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