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Odpowiedź :

10days

25 - 2x = 5

-2x = 5 - 25

-2x = -20      /:(-2)

x = 10

-28 + 7x = 21

7x = 21 + 28

7x = 49             /:7

x = 7

1/3x - 5 = 21        /*3

x - 15 = 63

x = 63 + 15

x = 78

1/12x - 3 = 7           /*12

x - 36 = 84

x = 84 + 36

x = 120

1/7x + 5/7 = 8/7            /*7

x + 5 = 8

x = 8 - 5

x = 3

6 - 1/6x = 5/6               /*6

36 - x = 5

-x = 5 - 36

-x = -31

x = 31

Jackoza

3. -2x = 5 - 25

   -2x = -20

   2x = 20   | : 2

   x = 10

4. 7x = 21 + 28

   7x = 49              | : 7

   x = 7

5. 1/3x = 21 + 5

   1/3x = 26           | * 3

   x = 78

6. 1/12x = 7 + 3

   1/12x = 10           | * 12

   x = 120

7. 1/7x = 8/7 - 5/7

   1/7x = 3/7            | * 7

   x = 3

8. -1/6x = 5/6 - 36/6

   -1/6x = -31/6

   1/6x = 31/6             | * 6

   x = 31

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