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Ответ:

1) 1,1x - 2,5 = 0,6x

0,5x = 2,5

x = 5

2) 6,75x = 2 1/4x - 9

6,75x = 2,25x - 9

4,5x = -9

x = -2

3) 16 - 9,5y = 3y + 21

-12,5y = 5

y = -0,4

4) 1 1/4y + 7,5 = 5y

1,25y - 5y = -7,5

- 3,75y = -7,5

y = 2

5) 6y - 2,8 = 2,5y

3,5y = 2,8

y = 4/5

y = 0,8

6) 0,5x - 7 = - 2/3x

1/2x + 2/3x = 7

7/6x = 7

x = 6