Solve for u
u=18
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u=30\times \frac{3}{5}
Multiply both sides by \frac{3}{5}, the reciprocal of \frac{5}{3}.
u=\frac{30\times 3}{5}
Express 30\times \frac{3}{5} as a single fraction.
u=\frac{90}{5}
Multiply 30 and 3 to get 90.
u=18
Divide 90 by 5 to get 18.
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