3/10 (3/2 - 3/4) times 1/y
3/10 (3/2 - 3/4) times 1/y = ((3/10)(3/2)-(3/10)(3/4))(1/y)
= (9/20 - 9/40)(1/y)
= (9/40)(1/y)
= 9/(40y)
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