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7. Among 100 students 12 got A in Math, 19 got A in Physics and 14 got A in Economics. 4 got A in

7. Among 100 students 12 got A in Math, 19 got A in Physics and 14 got A in Economics. 4 got A in Math and Physics, 6 got A in Math and Economics, 7 got A in Physics and Economics, and 2 got A in all three subjects. Find the number of students who got A in Math or Physics, but not Economics.

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