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2X - 5Y = 2- 5Y = - 2X + 2Y = (2/5)X - 2/5==================
5y+8=7y subtract 5y from each side , 5y+8=7y -5y -5y 8=2y /2 /2 4=y
25y2 - 49w2 = (5y)2 - (7w)2 = (5y - 7w)(5y + 7w)
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