Sue Ellen had a $10 coupon for a meal at her favorite restaurant. The waiter deducted $10 from her bill before adding a 20% tip. The final bill was $50. The equation below can be used to find b, the amount of the bill before the deduction was taken and the tip added.
1.2(b-10)=50
How much was the bill before the deduction was taken and the tip was added?