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2. Efectuați calculele: a) (2x+3)[5(x-3)-3(x-4)]-4(x + 1)²; b) (3x-4)[7(x+4)-4(x+6)]-(3x + 2)²; c) 4(2x-1)²-(4x + 1)[7(x-4)-3(x-9)]; d) (2x+3)[(x-1)²-(x-2)2]-4(x-2)(x+2); e) (2x + 5)[(x-2)²-(x-3)2]-4(x + 1)(x - 1); f) (2x+7) [(x-3)²-(x-4)2]-4(x-3)(x + 3). ​