Solve for u
u=12
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u=-42\left(-\frac{2}{7}\right)
Multiply both sides by -\frac{2}{7}, the reciprocal of -\frac{7}{2}.
u=\frac{-42\left(-2\right)}{7}
Express -42\left(-\frac{2}{7}\right) as a single fraction.
u=\frac{84}{7}
Multiply -42 and -2 to get 84.
u=12
Divide 84 by 7 to get 12.
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