3. Упростите выражение и найдите его значение:
а) 2x - 3(1 - у) + 4у при х = -2; у = 5;
б) 5(-4х + 0,6) + 17,5 х - при х= 0,8;
в) 25х - 4(5x - Зв) – 2(5 + 3х - у) при х = -7,6; в = 0,76.
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