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(3/2 ÷ 2/5) - (3/10 × 1/9) =
(3/2 × 5/2) - (3/10 × 1/9) =
15/2 - 3/90 =
15/2 - 1/30 =
225/30 - 1/30 = 224/30 = 112/15 = 7 7/15