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a≤x≤b

Ibland begränsas en ekvations lösningar till ett intervall t.ex.
2≤x≤5.
I det här fallet måste ekvationens lösningar vara minst 2 och max 5. Om man t.ex. får en lösning x=6, kan man utesluta den, eftersom den ligger utanför intervallet.

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