Respuesta :

(-2n+(-9))-(-7n+(-6))

(-2n-9)-(-7n-6)

There is a minus before the parenthesis, so you have to change the sign of the numbers inside the parenthesis

-2n-9+7n+6

5n-3
irspow
(-2n-9)-(-7n-6)

-2n-9+7n+6

5n-3