Solve for u
u=28
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u=12\times \frac{7}{3}
Multiply both sides by \frac{7}{3}, the reciprocal of \frac{3}{7}.
u=\frac{12\times 7}{3}
Express 12\times \frac{7}{3} as a single fraction.
u=\frac{84}{3}
Multiply 12 and 7 to get 84.
u=28
Divide 84 by 3 to get 28.
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