- 9/u = -6 what is u??

$$\\\frac{- 9}{u }= -6\\\\
$Multiply both sides by u$\\\\
-9=-6u\\\\
$Divide both sides by -6$\\\\
\frac{-9}{-6}=u\\\\
u=\frac{3}{2}\\\\
u=1\frac{1}{2}\\\\$$

U = 3/2

how? haha