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
(-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