Can anyone please help me?
I have my question in a picture along with the triangle I made.

Melanie is buying a bathing suit that costs 39.99. she is given a discount at the cash register of $6.00 when she scratched 15% off on a game piece for a store promotion. what will the sale price of melanie’s bathing suit be?

Ithink i know it but i want to be sure so can you me out ?

X– 4 = 12.5 can be written in words as