Рабочий лист «Решение уравнений» Вариант - 4 №1 (14 + 6x)(–9) – 6(11x – 14) = 15 №2 6(5 – 7x) = 4(8 + 8x) №3 20x – 7 = 15x – 4 №4 2 – 9x = 2 + 11(2 – 12x) – 9x

№1

(14 + 6x)(-9) - 6(11x - 14) = 15

-126 - 54x - 66x + 84 = 15

-42 - 120x = 15

-120x = 15 + 42

-120x = 57

x = 57 / -120

x = -19/40

x = -0.475

№2

6(5 - 7x) = 4(8 + 8x)

30 - 42x = 32 + 32x

-42x - 32x = 32 - 30

-74x = 2

x = 2 / -74

x = -1/37

x ≈ -0.027

№3

20x - 7 = 15x - 4

20x - 15x = -4 + 7

5x = 3

x = 3/5

x = 0.6

№4

2 - 9x = 2 + 11(2 - 12x) - 9x

2 - 9x = 2 + 22 - 132x - 9x

2 - 9x = 24 - 141x

-9x + 141x = 24 - 2

132x = 22

x = 22 / 132

x = 1/6

x ≈ 0.167