Solve for u
u=21
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-9\left(-\frac{7}{3}\right)=u
Multiply both sides by -\frac{7}{3}, the reciprocal of -\frac{3}{7}.
\frac{-9\left(-7\right)}{3}=u
Express -9\left(-\frac{7}{3}\right) as a single fraction.
\frac{63}{3}=u
Multiply -9 and -7 to get 63.
21=u
Divide 63 by 3 to get 21.
u=21
Swap sides so that all variable terms are on the left hand side.
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