In a small high school of 20 students, 6 students are taking algebra, 8 are taking geometry and 3 are taking both. How many students are not taking either?

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"6 students are taking algebra", but 3 of those are taking both
so 3 are taking just algebra
"8 are taking geometry", but 3 of those are taking both
so 5 are taking just geometry
3 - both
3 - just algebra
5 - just geometry
11 students taking algebra/geometry ___ 9 students (20-11) not taking either

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