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Annabelle wants to make curtains for two windows in her living room. The windows are each 3 ft wide. The material that she has is just the right size to match the height of the windows. The material she has is in a 9 foot roll, to be used for both windows together. She decides that she wants the curtains to be wide enough to extend a little bit beyond the window on each side. If she uses the whole roll of material, explain how she can calculate how far the curtains will be able to extend on each side of the windows and give the distance they will extend.
The distance the curtains will extend is ______________.
Explain your answer.