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- - 2. Efectuați calculele: a) (x-7)(2x - 1) - (2x)"; c) 7x(x - 5)- 4x(x - 8) - (73x)"; b) (73x) - 3(x + 1)(x + 2) + 9x; d) 5x(x − 3) - 3x(x - 4) - (V2x). -​.