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Mathematical problems of top students in sixth grade of primary school
Solution: Suppose X people fail for the first time.

3x+4+5=6(x-5)

3x+9=6x-30

6x-3x=9+30

3x=39

x= 13

3× 13+4+ 13=56 (person)

There are 56 students taking part in the math contest.

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