33. Является ли тождеством 1) 2x - 12 = 2(x - 6); 2) a-b = -(b - а): 3) Зm + 9 = 3(m + 9); 4) (a + b) - 1 = a + b; 5) (a+b) - () = a + b; 6) (а - а)(b+b) = 0;​
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