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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