Answer:
x = the number of lessons searched
member :
he pays $80 to be a member and $5 per lesson = 5x+80
non-member pays $15 per lesson = 15x
over write the equation to answer:
5x+80=15x
on result:
5x-15x=-80
-10x=-80
10x=80
x= 8
for 8 lessons the member and the non-member pay the same amount