Each student in a group of people plays at least one of hockey, tennis or football...?

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ishyy

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Ten students play hockey only,
Nine play football only.
Thirteen play tennis only.
6 play hockey and football but not tennis.
Seven play hockey and tennis .
Eight play football and tennis.
x play all three sports.

Write down an expression in terms of x for the number of students who play hockey and tennis but not football.
 
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