Idon’t get solving equations with variables on both sides with word problems

Rectangle leg this 11feet and perimeter of 38feet what is the width of the rectangle in feet

Astore has clearance items that have been marked down by 60%. they are having a sale, advertising an additional 55% off clearance items. what percent of the original price do you end up paying?

An 18% discount on a watch saved a shopper $72. find the price of the watch before the discount