Of the 30 students in my class, 11 practice taekwondo, 11 play piano, and 20 take lessons in math. 4 students play piano and go to math, 3 students do taekwondo and play piano, 5 students go to math and practice taekwondo, and 3 students do none of these. How many students do all 3?

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Of the 30 students in my class, 11 practice taekwondo, 11 play piano, and 20 take lessons in math. 4 students play piano and go to math, 3 students do taekwondo and play piano, 5 students go to math and practice taekwondo, and 3 students do none of these. How many students do all 3?
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