Sam and Peta compare the perimeters of their rectangular yards. The width of Peta’s yard is half that of Sam’s yard, as shown in the table. Three times the perimeter of Sam’s yard is equal to four times the perimeter of Peta’s yard. What is the width of Sam’s yard? Sams Yard - Length: 50 feet , Width: x feet
Peta's Yard - Length: 65 feet, Width: 12 x feet

Let x represent the width of Sam’s yard. Fill in the blanks to write an equation to represent the situation.