Given - x + 2Y = 5, then the value of 5 (x-2y) 2-3 (x-2y) - 60 is______ .
∵ - x + 2Y = 5, ∵ x-2y = - 5, ∵ 5 (x-2y) 2-3 (x-2y) - 60 = 5 × (- 5) 2-3 × (- 5) - 60 = 125 + 15-60 = 80
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