(64/25)?× (125/512) ? - 1 = 5/8
⇒ (8/5)2x× (5/8) 3x - 3 = 5/8 ⇒ (5/8)-2x× (5/8) 3x - 3 = 5/8 ⇒ (5/8) -2x + 3x - 3= 5/8 ⇒ (5/8) x - 3 = 5/8 ⇒ x - 3 = 1 ⇒ x = 4
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