A photo is 4 inches wide. It is placed inside a frame with a border that is x inches wide. The total width of the photo and the frame is 7 inches. Write an equation to model the situation. Then solve the equation to find the width of the border.
4 + x = 7
x = 7 - 4
x = 3
Is this what they want?
So:
4 + 2x = 7
2x = 7 - 4
2x = 3
x = 3/2
Is this correct?