# How do you simplify (-9)(-7)+(-9)(7) - (9)(-7)?

$\left(- 9\right) \left(- 7\right) + \left(- 9\right) \left(7\right) - \left(9\right) \left(- 7\right) = 63$
$\left(- 9\right) \left(- 7\right) + \left(- 9\right) \left(7\right) - \left(9\right) \left(- 7\right)$
$63 - 63 + 63 = 63$