Solve for f
f=15
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f=6\times \frac{5}{2}
Multiply both sides by \frac{5}{2}, the reciprocal of \frac{2}{5}.
f=\frac{6\times 5}{2}
Express 6\times \frac{5}{2} as a single fraction.
f=\frac{30}{2}
Multiply 6 and 5 to get 30.
f=15
Divide 30 by 2 to get 15.
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