# How do you simplify ((-9)(-20))/((-5)(4))?

$\frac{\left(- 9\right) \left(- 20\right)}{\left(- 5\right) \left(4\right)} = - 9$
$\frac{\left(- 9\right) \left(- 20\right)}{\left(- 5\right) \left(4\right)} = \frac{\left(- 9\right) \left(- 4\right)}{\left(- 1\right) \left(4\right)} = \frac{\left(- 9\right) \left(- 1\right)}{\left(- 1\right) 1} = \frac{9}{- 1} = - 9$