1. Записать в тетрадях число: 05.02.2026 Слова: «Классная работа» 2. Выполнить уравнения по образцу: Образец: 2-(x-7)=3, 2x- 3x+6=4x-1 14=3, 3x-4x=-1-6 2x=3+14, 2x=17, -x=-7 x=17:2, x=7 x=8,5. 1) 2x+8=6x-2, 2) 10y+3=2y-1, 3) -4+3к=8к+5. 4) 9+4a=8a-9, 5) 3в+9=8в+2, 6) 6-2c=3c-10, 7) 5-2y=8y+9, 8) -4x+3=4x-5, 9) 4a+4=-6a-5. 10) -5-(0,8t-1,2)=-t+7,2, 11) -5-(3a+1)-11=-16, 12) -3,2n+4,8=-2·(1,2n+2,4),

1. 2x + 8 = 6x - 2

   8 + 2 = 6x - 2x

   10 = 4x

   x = 10 / 4

   x = 2.5

2. 10y + 3 = 2y - 1

   10y - 2y = -1 - 3

   8y = -4

   y = -4 / 8

   y = -0.5

3. -4 + 3к = 8к + 5

   3к - 8к = 5 + 4

   -5к = 9

   к = -9 / 5

   к = -1.8

4. 9 + 4a = 8a - 9

   9 + 9 = 8a - 4a

   18 = 4a

   a = 18 / 4

   a = 4.5

5. 3в + 9 = 8в + 2

   9 - 2 = 8в - 3в

   7 = 5в

   в = 7 / 5

   в = 1.4

6. 6 - 2c = 3c - 10

   6 + 10 = 3c + 2c

   16 = 5c

   c = 16 / 5

   c = 3.2

7. 5 - 2y = 8y + 9

   -2y - 8y = 9 - 5

   -10y = 4

   y = 4 / -10

   y = -0.4

8. -4x + 3 = 4x - 5

   3 + 5 = 4x + 4x

   8 = 8x

   x = 8 / 8

   x = 1

9. 4a + 4 = -6a - 5

   4a + 6a = -5 - 4

   10a = -9

   a = -9 / 10

   a = -0.9

10. -5 * (0.8t - 1.2) = -t + 7.2

    -4t + 6 = -t + 7.2

    -4t + t = 7.2 - 6

    -3t = 1.2

    t = 1.2 / -3

    t = -0.4

11. -5 * (3a + 1) - 11 = -16

    -15a - 5 - 11 = -16

    -15a - 16 = -16

    -15a = -16 + 16

    -15a = 0

    a = 0

12. -3.2n + 4.8 = -2 * (1.2n + 2.4)

    -3.2n + 4.8 = -2.4n - 4.8

    -3.2n + 2.4n = -4.8 - 4.8

    -0.8n = -9.6

    n = -9.6 / -0.8

    n = 12

Ответ: решения уравнений выше