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11. Calculaţi: a) (x + 4)(3x-2)-2x(x-5)-(x-4)(x-3); b) (x-3)(4x-5)-3x(x-6)-(x + 4)(x + 5); c)(x-2)(4x-7)+ (2x - 5)(x-2)-(3x + 2)(x + 3); d) (x+3)(3x + 4)-(2x-1)(x+6) + (x-3)(x + 5).​