The sum of 5 times a number and 2 is the same as the number minus 2. Find the number.

Monica build a remote control toy airplane for science project to test the plane she launched it from the top of a building the plane travel a horizontal distance of 50 feet before landing on the ground a quadratic function which models the height of the plane in feet relative to the ground at a horizontal distance of x feet from the building is shown

Pranza plotted point a in the coordinate plane below.

4+(2+x) can you me solve this problem