How to select records filter by the value which stored in xml field

I read many datas to solve my problem,but those doesn't work...
At first, I create a table in sqlserver
CREATE TABLE [dbo].[Demo](
[ID] [int] IDENTITY(1,1) NOT NULL,
[Content] [xml] NOT NULL
Then I insert two records:
INSERT INTO Demo(Content) VALUES(
'<plan>
<teachers>
<teacher>1</teacher>
<teacher>2</teacher>
</teachers>
</plan>')
INSERT INTO Demo(Content) VALUES(
'<plan>
<teachers>
<teacher>3</teacher>
<teacher>4</teacher>
</teachers>
</plan>')
Now ,I want to get the records which the Content field's teacher=3. I try my best to sovle it ,but I can't.
Are there somebody can help me? Thanks !

You can use the .exist method to do that.  Try these:
SELECT *
FROM Demo
WHERE Content.exist('plan/teachers/teacher[. = 3]') = 1
DECLARE @teacherId INT = 3
SELECT *
FROM Demo
WHERE Content.exist('plan/teachers/teacher[. = sql:variable("@teacherId")]') = 1

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