(2p/1+p/7)÷(9p/10+4p/1)
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(2p + p/7) ÷ (9p/10 + 4p)
= (14p + p)/7 ÷ (9p + 40p)/10 = (15/7)p ÷ (49/10)p
= (15/7)p × 10/49p = 150/343
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