(7 + 4a) - (3 - 2a) - 4 + 6a, (-3a + 4)2 - 5a2 - a2 - 6a + 4, (3x - y)2 + 10xy - 9x2 + y2 + 4xy, (5b + 3) + 4 (3b - a) - 17b - 4a + 3, 3(4x - 5xy) - 2(8x + xy) - -4x - 17xy,

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