Выберите тождественно равные выражения. Запишите их в виде тождества: 1) 1,3(a-7) и 1,3 a-9,1; 2) 4 (x+3) и 4x+3; 3) 5(x-x) и 5; 4) 2a-9 и 3a-(a+9).
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