Выберите три тождества:

1) 3 (a + c + x) - 2 (a + c - x) - (a - c + x) = 2 (c + 2x)

2) 9 (x - 1) - 3 (2x - 3) = 3x

3) 2 (x - 3) -5 (x - 4) = 3x-14

4) 3 (2a-1) - 2 (3a- 1) = 1

5) 5 (0,5 + 2x) -5 (1,1- x) = 15x-3

6) 1- (1- (1-c)) = c-1

7) 0,5 (x + y) - 0,5 (x- y) -y = 1
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