PLEASE HELPPP IM NOT SMART EASY 10 POINTS

What is the answer to |-2x-5|-|-4+8| and x=7

Arestaurant offers a $12 dinner special that has 5 choices for an appetizer, 12 choices for an entrée, and 4 choices for a dessert. how many different meals are available when you select an appetizer, an entrée, and a dessert? a meal can be chosen in nothing ways. (type a whole number.)

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?