Please help me understanding this

Aparasailer is attached by cable to a boat, she wear catches air and raises her into the air when the boat slows down to turn back towards the beach the parasailer chute catches less air and dip 25 meters. She must decent another 45 meters to return to the boat. what is subtraction equation to find her original height above the boat before turn
Thank you
BJ

x - 25 = 45