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2x + 3y = 7 and 2x^2 + xy - 3y^2 = 28, then 1/2x - 1/2y =
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2x + 3y = 7 and 2x^2 + xy - 3y^2 = 28, then 1/2x - 1/2y =

User Morgan ARR Allen
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1) 3a + 5b = 26; a + 5b = 22 (2) x + 7y = 10; 3x – 2y = 7 (3) 2x – 3y = 9; 2x + y = 13

User Deau
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