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Let x be the number of students.

If there were 10 students more, each of them would have to pay $ 30
coach rent = (x+10)(30)

If there were 8 students less, each of them would have to pay $50.
coach rent = (x+-8)(50)

(x+10)(30) = (x-8)(50)

30 + 300 = 50 - 400

700 = 20x

x = 35

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