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Price: 50, Quantity:

50 = -5Q + 70

5Q = 70 -50

5Q = 20

Q = 4

Price: 40, Quantity:

40 = -5Q + 70

5Q = 30

Q = 6

Price: 30, Quantity:

30 = -5Q + 70

5Q = 40

Q = 8

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