Solve for u
u=25
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u=35\times \frac{5}{7}
Multiply both sides by \frac{5}{7}, the reciprocal of \frac{7}{5}.
u=\frac{35\times 5}{7}
Express 35\times \frac{5}{7} as a single fraction.
u=\frac{175}{7}
Multiply 35 and 5 to get 175.
u=25
Divide 175 by 7 to get 25.
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