A discrete mathematics problem by Brilliant Member

In a class of 58 students,
5 students like Geometry only,
2 students like Calculus only,
3 students like Algebra only,
21 students like both Geometry and Calculus,
16 students like both Algebra and Calculus,
9 students like Algebra, Calculus and Geometry,
None of the students hate any of the three subjects.
How many students like both Algebra and Geometry?

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