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A = 45/18 x - 30/25

A = - 1 350/450

A = (450 x  - 3) / (450 x 1)

A = - 3

B = 70/28 x - 16/- 80

B = 1 120/2 240

B = (1 120 x 1) / (1 120 x 2)

B = 1/2

C = - 21/- 55 x - 33/- 63

C = 693/3 465

C= (693 x 1) / (693 x 5)

C = 1/5.

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