Linear functions and equations in text

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The question is:

A rectangle has a width of 28cm. The one side is 2cm longer than the other side.

We are supposed to form an equation and then solve it, but I don't know to form an equation from that.

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Hints:

  1. What is the width of a rectangle?
  2. What are the sides of a rectangle?
  3. What do you want to determine?
  4. What can be equated?
  5. Is the solution to that problem really unique?