Membership to a music club costs $120. members pay $20 per music lesson and nonmembers pay $35 per music lesson. How many music lessons would have to be taken for the cost to be the same for members and nonmembers?
Let x = number of lessons
Members: 120 + 20x
For them to be equal: 120 + 20x = 35x
120 = 15x [subtract 20x from both sides]
8 = x [divide both sides by 15]